OF WASHINGTON. 119 



seem otherwise to differ in structure, it would be premature to 

 accord them generic separation. The character of the single 

 front tibial spur should not of itself, I believe, be entitled to 

 generic value. 



From the data above given it will be seen that the genus 

 Agnotomyia stands chiefly on neurational characters, which 

 are not very constant in this group. It is wholly unlikely, 

 however, that an aberrant Triptotricha will ever be found to 

 exhibit the neuration of Agnotomyia; but should such a case 

 occur, comparison with typical specimens will be necessary to 

 divStinguish it. 



I may add that Dr. K. Bergroth has pointed out that Lcew's 

 genus Triptotricha is a synonym of Dialysis Walker (Wien. 

 Ent. Zeit., VIII, 296). In the same paper Dr. Bergroth has 

 given a synopsis of the species, the two sexes being tabulated 

 separately, and has described D. disparilis n. sp. $ 9 from 

 Vancouver Island. 



Mr. Schwarz asked if anything was known of the habits and 

 early stages of these Diptera. Mr. Townsend replied that he 

 knew nothing of the habits and early stages except the state 

 ment made by Dr. Williston that the larvae live in decaying 

 leaves. The adults occur on low vegetation in woods. 



Mr. Fernow called attention to the ravages of Psilura 

 monacha in the pine and spruce forests of Germany, particu 

 larly in Bavaria. 



DECEMBER 4TH, 1890. 



nff^iU^ , 



Fourteen persons present. President Marx in the chair. 

 The following paper, by Mr. P. R. Uhler, was read by the 

 Corresponding Secretary : 



OBSERVATIONS ON SOME REMARKABLE FORMS OF 

 CAPSIDiE. 



BY P. R. UHI^ER. 

 Heidemannia. New genus. 



Form elliptical, resembling Salda in contour, nearly flat above. Head 

 exceptionally small, projecting above the pronotum, appearing hemi- 



