RILEY — LARVAL HABITS OF BLISTER-BEETLES. 561 



but not dorsallj, the mouth-parts — consisting of a bow-shaped labrum, 

 conical mandibles and maxillae, and exarticulate antennae — brown, rudi- 

 mentary, and tuberculous ; eyes small, imperfect, and scarcely raised. Six 

 brown conical tubercles in place of the thoracic legs. Stigmata as in full- 

 grown larva, but more conspicuous, being darker brown and raised. Anus 

 rounded and unarmed. Color gamboge-yellow. Chitinous covering firm, 

 and very faintly corrugate. The larval skin adheres, in shrivelled mass 

 with its dark mandibles ventrally, to the end of the body, and sometimes 

 extends to the middle. 



Third Larva. — Somewhat paler, more contracted and clumsy than 

 the ultimate stage of the second, but otherwise differing in no essential 

 features. 



Pupa. — Having the folded legs well-drawn back from sternum, the hind 

 legs reaching well nigh to anus, with a transverse dorsal row of spines on 

 all but the two or three terminal ventral joints, and about 6 much stouter 

 ones each side of prothorax, near its hind border. , 



Epicauta cinerea (Forster . 

 The black, gray-margined form {marginata Fabr.) I have had in all 

 stages from the egg to the coarctate larva, reared on the eggs of Calopte- 

 nus differentialiSi and the unicolorous form, from the scarabseidoid stage 

 of the second larva to the imago, on those of C. spretus. The egg is 1.3 

 mm. long, and somewhat stouter than in vittata. The triungulin is some- 

 what darker than that of viftata, and not quite so large (length 2.6 mm.) 

 The head has a less formidable aspect, and, with the prothoracic joint, is 

 more nearly of the same diameter as the abdomen. It may also be distin- 

 guished by the lateral dark brown of the prothorax being medial rather 

 than at the lower corners, and by joints 3, 9, 10 and 11 being dark — almost 

 black— across their entire dorsal posterior half. The metathoracic joint (3) 

 is always conspicuously dark. The central apical antennal seta is longer, 

 and the maxillary and labial palpi have frequently a minute apical, 2-joint- 

 ed, fleshy process. The spinous hairs on the body are somewhat less 

 strong. Otherwise it is undistinguishable, agreeing in every minute struc- 

 tural particular, as do all its subsequent phases. 



Epicauta pennsylvanica (DeGeer). 



The eggs of this species are but 0.9 mm. long. The triungulin averages 

 but 2 mm. in length, and, while having the same form and characteristics 

 as the other species, is easily distinguished by the following particulars, 

 aside from the smaller size : The color is darker and more uniform, joints 

 I, 4, 5, 10 and II contrasting less with the others. The prothoracic joint 

 is more slender, being about as long as wide. The maxillary palpi 

 have the terminal joint less flattened inside and surmounted with a small 

 fleshy 2 -jointed apical process: the maxillary piece is scarcely broader 

 than the palpi. The antennae have the apical tubercles of equal length, the 

 setous one, as also the labial palpi, likewise having a similar 2-jointed fleshy 

 apical process to that on the maxillary palpi. These minute processes 

 iii — 36 [Nov. 16, 1877.] 



