CEPHALEMYIA. 271 



finding no rest till they get into the water. The only communi- 

 cation which this grub has with the atmosphere is at its anal ex- 

 tremity, and therefore it has no respiratory organs at the anterior 

 extremity. Each plate at the other end is separated by a curved 

 line into two unequal portions, the smallest of which is contiguous 

 to the convex belly, and the largest to the concave back of the 

 animal. This last is distinguished by two hard brown kidney- 

 shaped pieces, a little elevated, with the concave sides turned to- 

 wards each other ; in this sinus is a single small white spot, which 

 appears to be a spiracle ; in the smallest portion are eight minute 

 circular orifices arranged in a line. Bracy Clark thinks that he 

 has discovered spiracles in this larva in the usual situation, but 

 Kirby believes that they are analogous to the spiraculiform tuber- 

 cles of (E. Oms." Generally distributed. (E. S. I.) 



Genus II. CEPHALEMYIA. 



CEPHALEMYIA, Clark, (Estrid. (1815); Mcq. ; Westw. ; Blanch. 

 (Estrus p., L. ; F. ; Schr. ; Hbst. ; Gmel. ; Don. ; Clark, L. T. ; Lea. ; 

 Latr. ; Fal.; Meig. 



Corpus sublineare, pubescens. Caput et thorax tuberculata. Caput 

 magnum, subtus tumidum, thorace vix angustius. Frons magna, 

 antice latior. Fades parva^ concava, antice angustior. Antenna 

 brevissimse. Alee sat breves ; vena costalis ala rnulto brevior ; pra- 

 brachialis cubitali ante ejus apicem juncta ; discalis transversa obliqua, 

 undulata. Alula maxima!. Abdomen subovatum, thorace paullo an- 

 gustius, D on longius. Fed es breves, tenues ; unguesetonychiaminuta. 

 Body nearly linear, pubescent. Head and thorax tuberculate. Head 

 large, tumid beneath, nearly as broad as the thorax. Vertex broad. 

 Front large, widening towards the face. Face small, concave, narrow in 

 front, with a row of short transverse furrows. Gena3 broad. Eyes of 

 moderate size, nearly elliptical. Antennae extremely short, seated in 

 the cavity of the face ; first and second joints very minute ; third round ; 

 fourth and fifth obsolete ; sixth setiform, stout, bare, thickened towards 

 the base. Thorax much longer than broad, with a slight transverse 

 furrow ; scutellum semicircular. Wings rather short ; costal vein end- 

 ing at some distance in front of the tip of the wing ; subcostal ending 

 at beyond half the length ; mediastinal ending at a little before two- 

 thirds of the length ; radial ending at beyond five-sixths of the length ; 

 cubital ending at the tip of the costal ; prtebrachial undulating and in- 

 clined upward shortly after its junction with the discal transverse, and 

 united to tlie cubital at a short distance from the tip of the latter ; pobra- 

 chial curved towards the hind border; discal transverse undulating, 



