10 bulletin: museum of comparative zoology. 



one and one-half times as long as the second ; second and the ones immediately 

 following between two and three times as long as thick. Head not thick antero- 

 posteriorly. Metanotum and metapleurae irregularly rugose; the mesonotum 

 without distinct parapsidal furrows. Base of second abdominal segment 

 fluted along the sides ; terebra a little shorter than the posterior tibia, the last 

 abdominal segment being much extruded also. Spur of posterior tibia indis- 

 tinctly preserved. Wings more or less infuscated toward the middle. Costal 

 cell present; veins and stigma dark, marginal cell rather small, shorter than 

 the stigma. This is a typical representative of the genus closely allied to the 

 recent P. caudatus Say. 



Six specimens. 



Type.— No. 2055, M. C. Z., Florissant, Col. (No. 4391, S. H. 

 Scudder Coll.). Other specimens, M. C. Z., Nos. 2056-2059, Nos. 

 845, 8389, 10894, 8111, S. H. Scudder Coll.); and A 97 from Professor 

 Cockerell, the latter in the Amer. Mus. Nat. Hist. 



The specimen from Professor Cockerell was collected by Mr. S. A. 

 Rohwer at Station 13. M. C. Z., No. 2059 (No. 8111 S. H. Scudder 

 Coll.) may not be the same species as the terebra and last abdominal 

 segment are more strongly exserted and apparently longer. 



BELYTIDAE. 



This family is known fossil only at Florissant so far as I am aware, 

 although some of the earlier references to Proctotrypidae may possibly 

 be based on members of the present group. In addition to Pantoclis 

 deperdita Brues (:06), I have the following: 



Belyta mortuella, sp. nov. (Fig. 3.) 



Male. Length 2.25 mm. Probably entirely dark colored, black or piceous, 

 perhaps the legs and antennae a little lighter. Antennae as long or somewhat 



exceeding the body in length, 

 •--••.., filiform but rather stout, the 



"^•^ ^ extreme apex not preserved. 



. . "^v^K^'Os Several ioints before the middle 



>>^-"i#' of the flagellum subequal, each 



about four times as long as thick, 



those following to near the tip 



isgtllf \ similar but somewhat shorter. 



Body shining, the mesonotum 



Fig. 3. — Belyta mortuella, sp. nov. Type. -, u ■, i __ i . „ 



J ^ Ji with deep and complete parap- 



sidal furrows; metathorax cari- 

 nated and quite distinctly areolated on the sides. The specimen is seen in 



