American Horse Fly (Tabanus americanus)
3/4-1 1/8″ (20-28 mm). Large, broad. Head tan to ash-gray between large green eyes and on rear surface. Antennae reddish brown. Thorax brownish to blackish with gray hair. Abdomen is blackish red-brown with short gray hair across rear margin. Hind tibiae do not have spurs. Wings smoky; brown to black near base.
Arizona blond tarantula (Aphonopelma chalcodes)
This 3 to 4 inch (70 to 100 mm) large bodied, burrowing spider is commonly seen during the summer rainy season in southwestern deserts. The female is usually a uniform tan color. The male has black legs, a copper-colored cephalothorax and a reddish abdomen. Their burrows can be as large as 1 to 2 inches (25 to 50 mm) in diameter, with some strands of silk across the opening.
Arizona Cricket (Gryllita arizonae)
Brown to black Front wing varying in length, covering half to entire abdomen Antennae about as long as distance from head to end of abdomen Wings held flat over body Hind wings folded and hidden under leathery front wings Adult Males and Females Female with long ovipositor (ventrally attached) in rear (may appear as two pieces); both sexes have cerci (segmented, tail-like appendages attached dorsally). The wings are fully extended over the abdomen. Some species may not have wings.
Immatures (different stages) Immatures look like adults, but do not have fully developed wings. Older nymphs may show development of wing pads. The female’s ovipositor begins to show before it is an adult and increases in length with each successive molt.
Arizona Preying Mantis (Mantodea)
Three distinct body regions: head, thorax (where the legs and wings are attached), abdomen. Part of the thorax is elongated to create a distinctive ‘neck’. Front legs modified as raptorial graspers with strong spikes for grabbing and holding prey. Large compound eyes on the head which moves freely around (up to 180) and three simple eyes between the compound eyes. Incomplete or simple metamorphosis (hemimetabolous). Adult Males and Females Females usually have heavier abdomen and are larger than males.
Bark Scorpion (Centruroides sculpturatus)
Arizona is home to the most toxic scorpion in the United States; the bark scorpion.
Hard exoskeleton. Cold blooded. Four pairs of walking legs and one pair of pedipalps or pincers for the capture and holding of prey items. Long, upcurved tail ends in a poisonous stinger used for prey capture and defense. They have several pairs of structurally simple eyes. Utilize sensory hairs and mechanoreceptors to locate prey by detecting vibrations, air movement and chemical stimuli.
Common Water Strider (Gerris remigis)
1/2-5/8″ (12-16 mm). Flattened, elongate. Dark brown to black. Short fore legs. Long slender middle and hind legs. Mostly wingless.
Daddy-long-legs (Phalangium opilio)
1/8-1/4″ (4-6 mm). Long thin legs. Body reddish brown. Legs dark with prominent paler coxae. Eyes on black turret; 1 eye to right, 1 to left.
Daring Jumping Spider (Phidippus audax)
Male 1/4-1/2″ (6-13 mm), female 3/8-5/8″ (8-15 mm). Black with a short gray or white crossband on abdomen and several gray or white spots. Pale markings, often yellow or orange in spiderlings. Chelicerae metallic green.
desert millipede (Orthoperus ornatus)
Millipedes have long, cylindrical bodies with 2 pairs of legs on each segment. New segments and pairs of legs are added each time the millipede sheds. Since it continues to grow and shed throughout its lifetime, it�s impossible to say how many legs a millipede has without counting. The common millipede in southern Arizona is a dark reddish brown, but millipedes in other areas may be tan to golden brown. Most desert millipedes are 4 to 5 inches (10 to 13 cm) long.
Flame Skimmer (Libellula saturata)
1 1/8-2 3/8″ (28-61 mm), wingspan 3 3/8-3 3/4″ (85-95 mm). Red with brown on top of head. Thorax brownish red without stripes. Wings yellowish with reddish veins and clear tips; brown streak near base of hind wing, far from front and hind margins.
Giant Crane Fly (Holorusia rubiginosa)
1-1 3/8″ (25-35 mm), wingspan to 2 3/4″ (70 mm). Large. Reddish brown or olive-green to orange with some white markings on sides and under thorax. Legs long. Wings clear. Larva, to 2 1/8″ (55 mm), is dull brown with tough skin.
Goldenrod Spider (Misumena vatia)
Male 1/8″ (3-4 mm), female 1/4-3/8″ (5-10 mm). Female yellowish to white with crimson streaks on each side of abdomen and a reddish-brown stain between eyes. Female’s legs pale. Male’s cephalothorax dark reddish brown with white spot in center and in front of eyes; abdomen white with 2 red bands. Male has 2 pairs of reddish-brown fore legs, 2 pairs of yellow hind legs.
Spotted Spreadwing (Lestes congener)
Male 1 3/8-1 5/8″ (35-42 mm), female 1 1/4-1 1/2″ (32-38 mm); larger in the West. male bronzy black above with yellowish markings; last 2 abdominal segments grayish. Female paler, abdomen reddish-brown. Wings clear; female’s longer than male’s. Naiad, to 1″ (25 mm), is pale brown.
Wolf Spiders (Pardosa species)
Male 1/8-3/8″ (4-10 mm), female 1/4-3/8″ (5-10 mm). Slender, long-legged. Dark or with lengthwise dark-and-light stripes. Covered with long hair. Upper row of large eyes occupies major area on the front of the head. Spines on legs relatively long.
Brown recluse spider (Loxosceles reclusa)
The brown recluse is one of three spiders with significant venom in North America.