290 ELEMENTARY STUDIES IN INSECT LIFE 



EE. Legs fitted for walking. Silphidae. 



(Carrion Beetles.) 

 AA. Head prolonged in front, forming a beak. 



Rhynchophora. 



B. Head drawn out into a proboscis. Antennae usually elbowed, 

 i, e., basal joint longer, and when directed laterally the other 



joints may be directed forward. Curculionidae. 



(Curculios or Weevils.) 



BB. Head not drawn out into a proboscis; i.e., the beak is 

 very short; antennae short with a broad club; tibia usually 



toothed on the outer side. Scolytidac. 



( Engravers.) 



HYMENOPTERA. 



A. With abdomen broad at the base. The thorax and abdomen 

 having a broad connection instead of being connected by a more 

 or less thread-like joint. Extremity of female equipped with 

 saw or boring apparatus, usually more or less concealed; vege- 

 table feeders. (Phytophaga or Sessiliventres.) 

 B. Front tibia with two apical spurs; abdomen of female 



equipped with a pair of saws. Tenthredinidae. 



(Saw-Flies.) 



BB. Front tibiae with one apical spur; abdomen of female 



furnished with a borer. Siricidae. 



( Horn-Flies.) 



AA. The abdomen connected with what appears to be the 

 thorax by a slender joint or petiole; in some long and thread- 

 like, in others short. (Petioliventres.) 



B. Trochanters of two pieces, female with ovipositor. (Para- 



sitica. ) ( Parasitic Insects.) 



C. Wings without a system of cross-veins forming inclosed 



cells ; the main direction of the veins being lengthwise of 



the wing. Chalcididae. 



(Chalcis-Flies.) 



CC. Wings with well-developed series of veins and cross-veins. 



Ichncumonidae. 

 ( Ichneumon-Flies.) 



BB. Trochanters undivided, abdomen consisting of three, four 

 or five visible segments. Insects of bright metallic colors ; 

 abdomen convex above, flat or concave below. (Tubulifera. ) 



Chrysididae. 

 (Ouckoo-Flies. 



