16 Key to Families of North American Insects. 



always at least one longitudinal vein reaching from base to apex; wing 



membrane with microscopic hairs. (Suborder TEREBRANTIA) 2 



Female without a modified ovipositor, the last segment of the abdomen tubular 

 in both sexes; wings often absent, both pairs similar in structure, the 

 fore wings with only a median longitudinal vein which does not reach to the 

 tip of the wing; wing membrane without microscopic hairs. (Suborder 

 TUBULIFERA.) (Phlceothrips, Trichothrips, Cryptothrips.) 



PHLCEOTHRIPIIXE 

 2. Ovipositor curved upwards; fore wings broad, rounded and with prominent 



veins; antennae nine-jointed, (^dlothrips) JSOLOTHRIPID.&) 



Ovipositor curved downwards; wings when present usually narrow and pointed 

 at tips; antennae seven- to ten-jointed. (Thrips [T. tdbaci, Onion Thrips] 

 Eftthrips [E. pl/ri, Pear Thrips; E. tritid, Strawberry Thrips], Heliothrips 

 [T. hcemorrhoidaUs, Greenhouse Thrips].) (PI. 2, figs. 21, 31.) 



THRIPIDJE 



ORDER MANTOIDEA. 



Large, poor-flying, deliberate-moving, predatory species with 

 long, spined front legs, which are formed for grasping prey. Body 

 elongate; head freely movable, not inserted in the prothorax, eyes 

 prominent; three ocelli; mouth inferior, mandibles strong, antennae 

 filament-like, comprising many similar joints; prothorax always 

 lengthened and movable; wings dissimilar, overlapping on the 

 abdomen; cerci jointed. Metamorphosis incomplete. Praying 

 Mantis. 

 (Stagmomantis.) (PI. 2, fig. 22.) MANTID^E 



ORDER BLATTOIDEA. 

 (OOTHECARIA, CURSORIA.) 



Moderate-sized, broadly oval, flattened, quick-running insects. 

 Head free but inflexed so as to be nearly or quite concealed be- 

 neath the pronotum, the mouth posterior or nearly so, mandibles 

 strong, usually two ocelli; antennae long, filamentous, many- 

 jointed; prothorax large, movable, usually transverse; wings 

 when present overlapped on the abdomen; fore wings parchment- 

 like, containing many veins, hind wings radially folding; legs 

 strong, alike, coxae large; cerci prominent and jointed. Metamor- 

 phosis slight. Roaches. 



(Phyliodrdmia, (=Blattella) [P. germdnica, Croton bug], Periplaneta, Isch- 

 noptera, Blatta.) (PL 2, figs. 23, 25.) BLATTID^E 



