284 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



26. EXETASTES CAERULEUS Cresaon 



Exetastes caeruleus Cresson, Proc. Ent. Soc. Philadelphia, vol. 4, p. 276, 1865; 

 female. 



Similar in form and structure to the three preceding species, but 

 with hypostomal carina only moderately high, body, including abdomen, 

 distinctly metallic blue, and legs beyond trochanters largely ferruginous. 

 Compared with the above description of matricu^ it differs further as 

 follows: 



Female. — Temples distinctly convex, distinctly though sparsely 

 punctate; face and frons more shining, frons nearly fiat; junction of 

 occipital and hypostomal carinae about basal v»*idth of mandible from 

 base of latter; lower cheek not excavated, the hypostomal carina only 

 slightly higher than normal; propodeum mat, punctate, sparsely so 

 above at base, moderately rugulose behind carina. 



Body, coxae, and trochanters black with distinct metallic blue 

 reflections; all femora and tibiae ferruginous; front and middle 

 tarsi infuscate, basal joint of hind tarsus black, other joints ferru- 

 ginous; wings rather deeply infumate. 



Male. — Essentially like female, but with wings subhyaline. 



Type locality. — Colorado. 



Type.— Acad. Nat. Sci. Philadelphia no. 1610. 



Remarks. — In addition to the type I have seen four females and one 

 male: A female homotype compared by myself with the tj^pe, Colorado, 

 C. F. Baker; two females, Creede, Colo,, 8,844 feet, August 1914, 

 S. J. Hunter (one in collection of Kansas University); one female, 

 Wliitehorse, Yukon, June 5, 1923, 1,000 feet, A. K. Kusche (this is 

 in the California Academ}^ of Sciences) ; and one m.ale from Colorado. 



27. EXETASTES ALTICOLA, new species 



In this species the scutellum is less distinctly flattened and only 

 very briefly margined at base, but it agrees well with all the other 

 kej' characters of the matricus group. 



Female. — Length 10 mm, antennae broken. Differs from the 

 above description of matricus as follows: Temples rather strongly 

 convex and nearly as long as short diameter of eye, distinctly punctate; 

 frons more densely punctate; malar space fully as long as basal width 

 of mandible; junction of occipital and hypostomal carinae distant 

 from base of mandible barely the width of latter; hypostomal 

 carina of normal height and cheek not excavated; eyes less strongly 

 convex and barely as long as superior width of face; antennae (tips 

 broken off); thorax more densely punctate; propodeum mat, densely 

 punctate except at base and in a narrow median area, apical areas 

 somewhat rugulose, apical carina indicated only medially; pleural 

 carina represented by a fine foveolate groove; first tergite barely twice 

 as long as broad at apex; ovipositor sheath as long as first tergite. 



