108 Transactions. — Zoology. 



slightly dilated at the tip, where there are two short bristles. 

 Proboscis (fig. 2) very short, almost obsolete, conical ; placed 

 so much beneath the down-turned head as to be extremely 

 difficult to detect. Feet (fig. 5) long and slender ; tarsus five- 

 jointed ; claw double (fig. 6) with three pulvilli. Wings (fig. 4) 

 with brown costal and sub-costal veins ; discoidal cell open ; 

 cubital cell large ; the postical vein appears to have a branch 

 almost if not quite disconnected. Length of the body, in the 

 usual position, nearly A- inch. 



The eggs of this insect are very small, sooty black, truncato- 

 ovate (fig. 7) ; as stated above, they are laid in such numbers as 

 to cover a twig with a black coating. 



The larvae are very minute, about g^ inch long ; dark-grey 

 or brown in colour ; elongated, narrow, tapering at both ends, 

 with twelve distinct segments, of which the fourth from the 

 head is the widest ; on each segment is a row of short fine hairs 

 (fig. 8). They are in constant motion, wriggling : the mode of 

 progression forwards is shown in fig. 9. The head is pointed and 

 terminates in two very small hooks, with a pad or pulvillus (figs. 

 10 and 11). The posterior extremity is also acute, ending in 

 three very minute points with, on each side, a thin curved 

 appendage (fig. 12). The spiracles are only two, very minute 

 circular orifices, situated on the last segment but one (fig. 12). 



Both Mr. Hudson and I tried without success to procure the 

 pupa?. The larva of a fly not far removed from Henops (Clitel- 

 I a ria) is said to take more than two years before undergoing its 

 transformation. 



In consideration of the fact that the larvae of the whole 

 family of Acroceiida have not hitherto been known, and that the 

 descriptions of the various genera are but fragmentary, the 

 above account of Henops brunneus may be of interest. The larva 

 would seem to be perhaps more similar to those of Cecidomyia 

 than to any others of the order, though the perfect fly is quite 

 different. 



