344 



middle of each segment, the hases of the hairs being generally fused; 

 hairs on remainder of surface shorter than those on carinae, and occa- 

 sionally pairs are fused on lateral surfaces ; ventral surface with 7 

 pairs of conspicuous pseudopods, all of which are armed on apices of 

 posterior surfaces with about 4 series of short blackish recurved 

 thorns, the apical row being strongest ; apex of abdomen as in Fig- 

 ure 12. 



Pnparium (PI. LXXXIII, Fig .13). — Length of body 11 mm., 

 caudal process, 5 mm. Yellowish brown, slightly shining. Surface as 

 in larva except that the hairs are less conspicuous, the carina:? are indis- 

 tinguishable, and the rugaj are much more numerous, as shown in Fig- 

 ure 13. The head is entirely retracted and the prothoracic thorns and 

 respiratory organs are brought almost to the antero-ventral margin 

 (Fig. 15) ; the pair of pupal respiratory processes, so conspicuous in 

 Tropidia qiiadrata, are represented by slight callosities of the surface 

 which are barely distinguishable ; ventral pseudopods much less con- 

 spicuous than in larva; apical process distinctly broader than high. 



The material from which the foregoing descriptions were drawn, 

 was obtained near Urbana, 111., under bark on a rotten tree-stump. 

 The specimens reared are recorded as pupating March 5 and emerging 

 March 19 and 21. 



Imagines in the laboratory collection are from the following Illi- 

 nois localities : Algonquin, Carlinville, and Urbana, the last-men- 

 tioned taken on April 20 ; the others without dates. 



The only previous American record of the larval habits that I 

 know of is that by Keen.* 



I know of no previous description of the larva; the pupa has been 

 very briefly described by Parker, f 



Ce;ria WI1.UST0NI Kahl 



Ccria willistonii Kahl, Kans. Univ. Quart., Vol. 6, 1897, p. 141. 



Puparium (PI. LXXXIII, Fig. 16). — Length of body 10 mm., 

 apical process 4 mm. Yellowish white, mottled with brown or black- 

 ish, opaque. (Anterior portion with respiratory organs missing.) Sur- 

 face covered with microscopic pale hairs. Dorsum with a median 

 longitudinal series of paired wartlike tubercles extending nearly to 

 apex, 6 pairs in all ; apices of tubercles with a few short setulose hairs ; 

 dorso-lateral margin with a single longitudinal series of 6 wartlike 

 tubercles, each of which is slightly caudad of the corresponding sub- 



*Can. Ent., A^ol. Ifi, 1884, p. 147. 



tProc. Ent. Soc. Wash., Vol. 17, 1915, p. 147. 



