122 Key to Families of North American Insects. 



Clypeus, the sclerite bearing the labrum (Hymenoptera) ; a horseshoe-shaped sclerite 



under the margin of the mouth (Diptera). 

 Coarctate, with narrowed base and enlarged tip. 



Compressed, flattened from side to side, as distinguished from depressed. 

 C6nnate, immovably united, fused. 

 Constricted, narrowed in the middle. 



Cdrium, an elongate middle part of the fore wing (Hemiptera) . 

 Cdrneous, horn-like in texture. 



Costa, the front margin of the wing, considered as the first vein. 

 Costal area, the part of the wing immediately behind the front margin. 

 Costal cell, the space of the wing in front of the subcostal vein. 

 C6xa (-xae), the basal joint of the leg, sometimes quite fused with the body. 

 Ctenidium (-ia), a comb-like row of bristles. 

 Cftbitus, the fifth of the main veins of the wing. 

 Cursdrial, fitted for running. 



Declivity, the abruptly bent apex of the elytra (Coleoptera) . 

 Decumbent, bending downward. 

 Denticulate, with minute tooth-like projections. 

 Dichoptic, eyes not touching (Diptera). 

 Digitate, with finger-like processes. 



Dorsal, pertaining to the upper surface or back of the body. 

 Dorsocentral bristles, several rows of bristles near the middle of the mesonotum 



(Diptera) (PI. 13, fig. 302, DC). 



Ectoparasite, a parasite which lives on the exterior of animals. 

 Elytron (-ra), the horny upper wings, or wing covers, of beetles. 

 Empddium (-ia), a single middle pad between the tarsal claws (Diptera). 

 Epiphysis (-ses), a lappet-like process. 

 Epipleura (-rse), the infolded edge of the elytra (Coleoptera). 

 Epistome, the lowest part of the face. 

 Epizoic, living on the outside of animals. 



Eye-cap, a group of modified scales overhanging the eye (Lepidoptera) . 

 Facial plate, the central part of the face (Diptera). 

 Femur (-mora), the thigh or third division of the legs. 

 Filiform, hair-like, or filamentous, longer than setaceous. 

 Flabellate, with fan-like processes or projections. 

 Flabellum (-la), a leaf -like or fan-like process. 

 Flagellum, the distal part of the antenna when lash-like. 

 Fontanel, a small, depressed, pale spot on the front of the head between the eyes 



(Isoptera). 



F6rcipate, bearing pincers, or pincers-shaped. 

 Frenulum, a strong spine at the front basal angle of the hind wings (Lepidoptera) 



(PI. 10, fig. 226). 



Front, the forehead, between the antennae, eyes and ocelli. 

 FrontMia, the central strip of the front (Diptera) (PI. 13, fig. 304). 

 Fr6ntal lunule, a small crescent-shaped space just above the antennae (Diptera) 



(PI. 13, fig. 304). 



