250 T. D. A. COCKERELL. 



In Entomological News, v, p. 47, it is recorded that Professor L. 

 Bruner found R. sackeni near Colorado Springs, Colorado, and 

 observed it apparently deposity eggs in a stem of Eriogoiivm alatum. 

 I have examined two specimens in the collection of the Colorado 

 Agricultural College, collected at Fort Collins, Colorado, June 12th ; 

 also one from Clark County, Kansas, June, collected by Dr. Snow. 



Rliyiicboceplialus subnitens n. sp. 



5 . — Smaller than R. aackeni Will. ; length of wing just over 8 mm. (over 9i in 

 sackeni) ; pubescence paler, with a sort of greenish-grey tint; abdomen less hairy, 

 the bases of segments 2-4 broadly exposed, shining black ; ovipositor shorter, with 

 a stronger, more even curvature; eyes apparently lighter and redder; ultimate 

 branches of cubitus (bounding second posterior cell of Williston) uniting only a 

 very short distance before margin of wing (a considerable distance in sackeni). 



Hab. — Clark Co., Kansas, June, alt. 1960 feet {Snow). In the 

 collection of Prof. A. L. Melander. A female of B. sackeni Will, 

 also comes from Clark Co., bearing exactly the same data as the 

 type of R. subnitens. Two males of R. sackeni, agreeing in appear- 

 ance with the Clark Co. female, are also before me, loaned by the 

 U. S. National Museum. They are labelled Colorado, 8-9000, the 

 latter doubtless referring to the altitude in feet. The collector is 

 not indicated. 



In certain respects, the venation of Rhynchocephalus is quite 

 variable. Thus : 



Third submarginal cell {Williston;, i. e. cell bounded by M^ and M2. 

 (a) Open at apex, often quite broadly. R. subnitens : R. sackeni. 

 ib) Closed far below margin of wing, with a small cell at its apex, and the 

 single nervure beyond about as long as that at end of second posterior 

 cell. Right side of one % R. sackeni. 

 (c) Sessile at base (i. e. as Williston figures for R. volaticKS). 



R. subnitens ; R. sackeni. 

 id) Sessile and narrowly truncate at base. R. sackeni, one % . 

 (e) Short-stalked at base. R. sackeni, one % . 

 Second posterior cell (Williston), i. e. cell bounded by Cui and Cuj, according to 

 my interpretation. Sometimes the lower side is a little lower than 

 that of the cell basad of it {fourth posterior), but usually these prac- 

 tically coincide. The difference in the position of the apex of the cell 

 appears to be a specific character, so far as the material shows. 



(2) Group (subg. ?) of R. volaiicus. 

 Branches of cubitus not meeting = second posterior cell open (Williston). 



Rhyiicliocephalus volaficiis Williston, Can. Ent., xv, p. 71. 

 Florida. 9. — Length 12 nnn., wings 11 mm.; black, with light 

 yellowish pile; abdomen distinctly fasciate ; third joint of antenna' 



