114 PROC. ENT. SOC. WASH., VOL. 21, NO. 5, MAY, 1919 



Derocentrus texanus (Ashmead). 



Mesostenus longicaudis Cresson, Trans. Am. Ent. Soc., vol. 4, 1872, p. 164, 

 (not Brulle). 



Coleocentrus texanus Ashmead, Proc. U. S. Nat. Mus., vol. 12, 1890, p. 444. 

 Mesostenus macrunis Dalla Torre, Cat. Hym., vol. 3, 1901-1902, p. 544. 



(New name for longicaudis Cresson, not Brulle.) 



Nematopodius exclamans Viereck, Trans. Kans. Ac. Sci., vol. 19, 1904. p. 318. 

 Nematopodius longicaudus Viereck, loc. cit., p. 318. 



Careful comparison of fourteen specimens from Texas, New 

 Mexico, Colorado, Kansas, Maryland, and Virginia, including 

 Cresson's type, Ashmead's paratype, and a homotype (Gahan) of 

 Viereck's specimen discloses no differences of specific value. 

 There is considerable variation in the propodeal carinae, the 

 sides of the areola and the median portion of the apical carina 

 being weakly developed or absent; and the black color of the 

 thorax is as described by Viereck to entirely absent. 



Ashmead's type has disappeared unless, as I suspect, it is the 

 same specimen as Cresson's type. 



Derocentrus gracilipes (Cresson). 



Mesostenus gracilipes Cresson, Proc. Ac. Nat. Sci. Phila., 1878, p. 36o. 

 Nematopodius gracilipes Viereck, Trans. Kans. Ac. Sci., vol. 19, 1904, p. 3 is. 

 There is nothing in the description of this species to distinguish 

 it from texanus (Ashmead), and no specimen is available for com- 

 parison. 



Genus Cyrtobasis, new genus. 



In Foerster's, Ashmead's, and Schmiedeknecht's keys to 

 Hemitelini runs to Naetes Foerster, but the type is apparently 

 not congeneric with the genotype of Naetes and only included 

 species, Naetes rufus Brischke, differing structurally from the 

 original description of that species as follows: propodeum with 

 posterior face concave, the bounding carina very high and angulate 

 on each side, median longitudinal carina lacking except at base, 

 the areola open at the sides; first tergite with strong dorsal 

 carinae; ovipositor not nearly as long as abdomen. Certain 

 of the color characters mentioned by Brischke which I believe 

 to be of generic value are also lacking in the present genus: 

 antennae not annulated; wings not fasciate. 



Body robust, densely, coarsely sculptured; head strongly transverse, temples 

 flat and narrow; vertex broad, ocelli in a very low triangle ; eyes parallel within ; 

 face broad, convex, with a median rounded elevation; cylpeus barely distinct 

 from face, broadly truncate; mandibles short, stout, and with very small 

 teeth; malar space long; checks convex; antennae nearly as long as body, 

 somewhat thickened beyond middle and tapering to the apex; first two joints 



