Maskell. — On Henops brunneus. 107 



in which it is mentioned were Hutton's " Catalogue" and West- 

 wood's " Classification of Insects." In the first, the description 

 given is very short and indefinite : in the second it is stated that 

 Henops and its allied genera are very little known, and " the 

 larvae have not been observed." I placed one of the apple- 

 twigs, covered with eggs, in a glass box, in the hope that the 

 larva? might possibly be hatched, and. after about five or six 

 weeks, I found a perfect cloud of minute larvae, wriggling in the 

 liveliest maimer. Having thus achieved a further stage of 

 knowledge of this species, and the fly itself being in some 

 respects rather a curious one, I have ventured to bring forward 

 the following description and illustrations of the larva and the 

 imago. Unfortunately, not being able to procure a supply of 

 apple or peach leaves, I have not succeeded in feeding the larva? 

 and obtaining pupse. I tried various leaves as food for them, as 

 well as giving them earth to burrow in, but they all died. 



'Order. DIPTERA. 



Sub-Order. Ovipara. 



Family. Acrocerid^:, Leach. 



(Inflates, Latreille; Vesiculosa, Macquart.) 



Body short and thick ; head bent down, small, entirely 

 occupied by the eyes ; thorax and abdomen large, inflated ; 

 proboscis variable, sometimes long, sometimes absent. 



Genus Henops, Illiger. 



(opcodes, Latreille.) 

 Proboscis very short, scarcely noticeable ; antennae of two 

 short joints with a long style. Eyes naked, compound. 

 Abdomen broader than the thorax. 



Henops brunneus, Hutton. 

 (Catal. of Dipt., 1881, p. 25.) 

 Flies (fig. 1) rather large, but squat-looking and heavy ; 

 motions very slow. Thorax much elevated, the head being bent 

 down beneath it so as not to be visible when the insect is viewed 

 from above. Abdomen round and swollen, wider than the 

 thorax but seeming as if cut oft short, the posterior extremity 

 being turned under ; there are six segments on the abdomen. 

 Colour dark brown, almost black, on the thorax, with short 

 yellow hairs ; abdomen dark brown, with a yellow band marking 

 each segment ; head black ; wings hyaline ; halteres yellow. 

 The winglets are very large and scale-like. Eyes very large, 

 compound, occupying all the upper part of the head, but not 

 highly convex (fig. 2). Antenna (fig. 3) inserted in front, 

 between the eyes : two-jointed, both joints very short ; the style 

 is very long, inflated near the base, narrow in the shaft and 



