FIELD BOOK OF INSECTS. 



Chlamydini 



See the discussion under Clythrini, from which tribe 

 these beetles differ by having the upper surface of the 

 elytra and pronotum covered with wart-like tubercles and 

 by having their short, serrate ("saw-toothed") antennae 

 received in grooves on the under side of the thorax. "The 

 legs are closely contractile and when disturbed the beetles 

 draw them and the antennas in and feign death. They 

 then resemble the excrement of certain caterpillars so 

 closely as to render their detection difficult, unless the 

 collector is in especial search for them, and it is said that 

 birds will not pick them up for the same reason." The 

 larvae are case-making leaf-feeders and pupate in their 

 cases, which they first attach to twigs. We have two 

 genera: Chlamys, whose antennas are serrate from the 

 fourth or fifth joint; and Exema, whose antennal serrations 

 begin at the sixth joint. 



Cryptocephalini 



See the discussion under Clythrini, from which tribe 

 these beetles are distinguished by the antennae being usually 

 long and slender, and by the prosternum extending be- 

 tween the front coxas. We have six or eight genera and 

 numerous species, most of which are "variegated with 

 various combinations of spots or stripes which are some- 

 times very inconstant, so that numerous varieties have 

 been named." One of the variable and common species is 

 Cryptocephalus venustus. As its generic name indicates, 

 its head is hidden, the prothorax covering it above. It is 

 nearly .25 in. long and, in the typical form, the head and 

 pronotum is reddish-brown, the latter having a narrow 

 edging and two oblique spots yellow ; the elytra are yellow, 

 each with two broad, oblique, black or brown stripes. It is 

 found on potato and other garden, as well as wild, plants. 



Eumolpini 



The beetles of this tribe are usually of a uniform metallic 

 color, although some are dull yellow or spotted. Their 



366 



