230 



PSYCHE. 



[April 1 



on the front pait of the thorax only- 

 The male forceps is rather large, as 

 described by Aldrich. 



In Bigot's collection I noticetl a 

 specimen from Washington State (at 

 that time a Territory), collected by 

 Morrison. The brown pattern is pro- 

 longed to the posterior margin, as in 

 Aldrich's specimen. I have no donbt 

 that all tiiese specimens belong to the 

 same species. 



But in the same collection I saw a 

 Pedicia from Mt. Hood (Morrison) 

 with a very extraordinary modification 

 in the coloration of the wings. To the 

 pattern of P. obtusa is added a broad 

 brown border, running along the pos- 

 terior margin of the wing, from the 

 root to the apex, where it is bounded 

 by the posterior branch of the fork of 

 the third vein ; the breadth of the fork 

 itself remains hyaline. The second 

 posterior cell, in the specimen, was 

 remarkably small. The abdomen was 

 broken, and therefore a comparison 

 with that of P. obtusa not possible. 

 Was this a different species, or also a 

 mere variety .? 



Bittacomorplia occidentalis Aldr. 

 The detailed description of this species 

 is a very interesting addition to our 

 knowledge, and I have no doubt that 

 the Californian specimens, which 1 saw 

 in Verrall's collection, and suspected as 

 belonging to a species different from 

 the eastern B. clavipes (O. S., Cat. 

 N.Am. Dipt. p. 36). reallv belong to 

 B. occidentalis. 



TricJiocera Irichoptera O. S., 

 Western Dipt., p. 204. This was the 

 only specimen of tlie genus Trichocera 



which I capturetl iluring a seven 

 months' residence in California. It is 

 distinguished from the other Tricho- 

 cerae by the distinct pubescence of its 

 wing-veins ; in other respects, and espe- 

 cially in the venation, there is no reason, 

 according to my statement, to distin- 

 guish it from a true Trichocera. During 

 my visit to Bigot I discovered three 

 female specimens of a Trichocera with 

 pubescent wing-veins in his collection, 

 brought from Washington State by 

 Morrison, and about which I took 

 down the following notice : " They 

 are larger th;ui T. trichoptera O. S. 

 and have distinct stripes on the thoracic 

 dorsum. They differ from typical 

 Trichocerae in having the seventh 

 longitudinal vein concave., and not 

 convex : the ovipositor has not the shape 

 characteristic of that genus (with the 

 convexity turned upwards) ; it consists 

 of a pair of oval, finely pubescent, 

 closel}' approximate valvules." For 

 the detailed character of Trichocera T 

 refer to Monogr. N. Am. Dipt, iv, p. 

 333, and for the convex seventh vein to 

 tab. ii, f. 13 of the same volume. 

 Now the three females from Wash- 

 ington, with their pubescent venation 

 and their concave seventh vein, come 

 very near to European T. hirtipennis 

 Siebke, for which the new genus 

 Diazoma Wallengr. (name preoc- 

 cupied) was established. To those 

 who will come across the species from 

 Washington it will belong to determine 

 whether they are, in all respects, 

 generically identical with Diazoma. 

 The literature on the subject thev will 

 find in my Studies on Tip. ii, p. 2S1 



