and the want of such an opportunity has prevented me from 

 investii^ating the trophi of this genus so well as I could wish, 

 which I the more regret, because Fabricius, who has given an 

 account of those organs, appears not to have been satisfied ; 

 and I confess that in my specimen, which appeared to be quite 

 perfect, I was not able to detect the parts that he has described. 

 Meigen, for reasons similar to my own, has not given figures 

 of the mouth. The different opinions respecting its affinities 

 render a knowledge of the trophi very desirable, and ab- 

 solutely necessary to decide this point. Latreille and Leach 

 placed the family to which Henops belongs between the Bom- 

 bylidce and Syrphidce ; Meigen, between his TachydromicB and 

 Stratiomydie. I feel persuaded that Latreille's locality is the 

 more natural, for even Meigen includes the genus Cyrtus 

 with his Injiatce ; and the structure of the proboscis of that 

 genus, no less than the nervures of the wings, render it im- 

 possible, we conceive, to remove it from the Bombylid/c ; 

 whilst the structure of the antennae and the inflated abdomen 

 show that there is nothing but the wings in Hetioi^s analogous 

 to the habit of the Stratiomyda. 



Our genus is distinguished from Ac7'0cera, to which it is 

 closely allied, by its subclavate antennae, which are inserted 

 below the union of the eyes, by its almost nerveless wings and 

 large squamulae. 



The only 2 species in British cabinets are, 



1. Henops gibbosus Lmn. — Meig. Syst. Besch. tab. 24.y^ 1 5. 



— Taken in May and June on Wimbledon 

 Common, and in Coombe Wood. 



2. Henops marginatus Meig., which has several times oc- 



curred in the New Forest. My specimens I 

 purchased of Mr. Joseph Standish, who beat 

 them out of old white thorn bushes that 

 were covered with lichen, the end of June 

 and beginning of July. They were so sluggish 

 in the net that they laid with their wings closed, 

 which made it difficult to detect them; and the 

 least pressure destroyed the rotundity of their 

 bodies, which are very thin, and with the 

 large wings and scales appear to be well 

 adapted to enable the insect to float like a bal- 

 loon in the air, subject to the influence of any 

 current that may prevail. 

 The plant is Chtysosplenium oppositifoliu7n (Opposite-leaved 

 Sengreen). 



