JOUBNAIi OF ENTOMOLOGY AND ZOOLOGY 21 



ERIOCERA LONGICORNIS Walker 



1848 Anisomera longicornis Walker ; List Dipt. Brit. Mus. ; 

 vol. I, p. 82. 



LARVA 



Length, not fully extended, 13-13.5 mm. ; diameter, 2 mm. ; at 

 subterminal swelling, 2.4 mm. 



Color of larva light yellowish; almost uniformly cylindrical; 

 the prothorax a little shorter than the other two thoracic seg- 

 ments; first abdominal segment simple, a little shorter than the 

 metathorax; remaining abdominal segments with a faint basal 

 constriction, dividing the segment into two annulets; remaining 

 segments gradually increasing in length toward the end; the 

 tenth segment is capable of being enormously distended; the 

 last segment is narrowed, tapering to an obtuse point ; this 

 segment is clothed with numerous appressed hairs and two 

 or three long, delicate hairs on the side of the segment. 



Head-capsule long and narrow, measuring 1.5 by .275 mm. 

 On the antero-dorsal portion of the head-capsule are the two 

 genal plates (Snodgrass terminology), these rather broad, 

 separated from one another along the dorsal median line by a 

 wide space; the cephalic inner angles produced entad into 

 prominent lobes (plate I, E), the caudal margin of the plates 

 produced caudad in a fringe-like comb of ehitinized points; 

 these genal plates (which presumably include the vertex and 

 genae) are only about two-fifths the length of the head-capsule. 

 Ceplialad of the genal plates is a rounded median lobe (frons 

 and clypeus) bearing at its apex a few small tubercles and a 

 small quadrate projection (labrum) ; the lateral margins of this 

 sclerite are gently rounded, not produced cephalad into promi- 

 nent lobes. This plate consists of the fused frons, clypeus and 

 labrum. Laterad of the genal plate is an elongate ehitinized 

 piece articulated with the base of the mandible on its dorso- 

 lateral aspect, fused or closely applied to the genal plates for 

 most of the length of the latter, thence articulated end-to-end 

 with another elongated bar of chitin which extends caudad, 

 expanding out at its tip and becoming approximated with its 



