544 U. S. NATIONAL MUSEUM BULLETIN 216 



2. Brachycyrtus ornal us Kriechbaumer 



Figure 327,j 



Brachycyrtus ornatus Kriechbaumer, 1880, Corresp.-Blatt. Zool.-Min. Ver. Regens- 



burg, vol. 34, p. 163; ?. Type: 9, near Munich, Germany (lost). 

 Brachycyrtus chrysopae Walley, 1940, Canadian Ent., vol. 72, p. 86; 9. Type: 



9 , reared from chrysopid, near Baynes Lake, B. C. (Ottawa). 

 Taxonomy: Walkley, 1956, Proc. U. S. Nat. Mus., vol. 106, p. 325. 



Front wing about 3.5 mm. long. The characters in the key and 

 the figure of the color pattern of the hind leg should make this species 

 easy to distinguish. Fuller descriptions are in the references above. 



Specimens: 9, swept from juniper tree in semidesert, near Roosevelt 

 Lake, Ariz., Apr. 27, 1947, H. and M. Townes (Townes). 9 (type of 

 chrysopae) , reared from chrysopid, near Baynes Lake, B. C, Aug. 26, 

 1938, D. H. Ross (Ottawa). 9, Robson, B. C, Sept. 17, 1947, H. R. 

 Foxlee (Washington). 29, Mayo, Md., Oct. 27, 1945, H. and M. 

 Townes (Townes) . cf , 69, collected around Pinus virginiana in over- 

 grown fields, Takoma Park, Md., Oct. 7 and 20, 1945, H. and M. 

 Townes (Townes). & , Hocking Co., Ohio, June 26, 1938, C. F. Smith 

 and C. K. Smith (Washington). 



This species is transcontinental in the Transition and Upper Austral 

 zones and occurs also in Europe. It occurs around scattered small 

 conifers in relatively dry situations. 



Subfamily Acaenitinae 



Figures 308,a-310,a 



Front wing 5.0 to 19 mm. long; apical margin of clypeus thick and 

 more or less truncate, thin and broadly convex, or weakly bilobed and 

 with a median tubercle; labrum usually projecting and semicircular 

 or elliptic but in Coleocentrus hidden and with the apex notched; pro- 

 podeum with a variable number of carinae, often well areolated ; tarsal 

 claws simple or with an acute accessory tooth; first sternite free from 

 or fused with its tergite, the tergite with or without a glymma ; spiracle 

 of first tergite near the middle; epipleura very narrow to moderately 

 wide; apical third to half of abdomen somewhat compressed; female 

 subgenital plate enlarged, sclerotized, triangular, and folded on the 

 midline, its apical point reaching or surpassing apex of abdomen. 



The larvae, so far as known, resemble the larvae of the Micro- 

 leptinae (so far as these are known). The antenna is vestigial; the 

 mandible is small and without teeth, and the stipital sclerome is 

 absent. 



Regarding the relations of the genera within the tribe, Coleocentrus 

 appears to be a primitive and ancient type, Mesoclistus is related to 



