ZEUGOPHORA SCUTE LLARIS 253 



Suffrain gives the size as 2 to 2^ lines which is practically 

 4.5 mm. Judging from my material the adult beetles vary con- 

 siderably in size, but two sizes clearly predominate, the smaller 

 ones measuring a scant 4 mm., while the larger ones measure 4.5 

 mm., or slightly above. 



The prothorax has the conical prominence on either side, which 

 is so characteristic of the genus Zeugophora (fig. 8). 



The color markings are striking; the head, prothorax, meso- 

 thorax, scutellum and legs are straw or amber, while the meta- 

 thorax, abdomen and elytra are black. The antennae are com- 

 posed of eleven segments, the first three of which are usually 

 amber or straw, the fourth brown and the remainder black. The 

 eyes and mandibles are black. 



The most characteristic structural features, aside from the 

 prominence on the prothorax, are found on the legs. There is a 

 pair of spurs on the distal end of the tibia (figs. 10 to 12). The 

 tarsus is four-jointed, the penultimate segment of which bears 

 a very large cloven or bifid pad, upon which the insect walks. 

 This pad is covered by a dense coating of long bristles (figs. 10 

 to 12). The elytra are coarsely punctate and the entire body 

 is sparsely pubescent except the tarsi, which are hairy or bristly. 



THE EGG 



Eggs were secured from only one insect, although a consider- 

 able number were kept in captivity and fed upon leafy branches 

 of the Cottonwood. The egg is microscopic and appears to be 

 surrounded by an extra envelop and filament similar to that of 

 the decapod-crustacean's egg. If this observation is correct 

 it appears to be unusual. 



Judging from the fact that only one larva inhabits a leaf I 

 have thought that the eggs may be laid singly, although this is 

 mere supposition. Kaltenbach claims to have seen two or three 

 larvae of Z. flavicollis in a single leaf in Sweden. 



