CHARLES W. HOOKER. 53 



Allocamptus Forster, Verb. Nat. preuss. Rheinl., 25, p. 150 (Nee 



Thomson) 1868. 



Henicospilus Bridgman and Fitch, The Entomologist, 17, p. 176.. 1884. 



Dispilus Kriechbaumer, Berl. Ent. Zeitschr., 39, p. 309 1894. 



Enicospilus Pi&\LmQ&A, Proc. U. S. Nat. Mus., No. 1206, pp. 87, 



170 (Vol. XXIII) 1900. 



Trans. Ent. Soc. Lond., pp. 270, 354 1900. 



Trispilus Kriechbaumer, Zeitschr. Syst. Hym. Dipt., I, p. 156. ..1901. 



Pterospilus Kriechbaumer, Idem 1901. 



Henicospilus Dalla Torre, Cat. Hym., Ill, p. 180 1901. 



Enicospilus Felt, N. Y. State Mus., Bull. 76, pp. 101, 107 (nine- 

 teenth Rept. State Ent.) 1903. 



Henicospilus Szepligeti, Gen. Ins., Hym., 34me Fasc, p. 25, n. 7.. 1905. 



Schulz, Spolia Hym., p. 277 1906. 



Eniscospilus Schmiedeknecht, Opusc. Ichn., 18, p. 1428, n. 4 1908 



Anterior wings without areolet ; discocubital vein not an- 

 gularly broken but straight or bent, not appendiculate ; trans- 

 verse-cubital vein straight, discocubital with one or more 

 chitinous maculae in a glabrous area ; face unarmed, clypeus 

 truncate. Ocelli large, claws long and pectinate. 



Generic type. — E. merdarius Grav. 



The chief generic characters of this genus lie in the wings 

 and the members resemble representatives of the Genus 

 Eremotylus in many respects. The venation is similar in 

 the characteristic shape of the radial and discocubital veins, 

 the only important difference being in the presence of maculae 

 in Enicospilus. Just how constant these are can not be deter- 

 mined from data now available, but it is evident that the size 

 and shape of a macula often varies somewhat and may be 

 entirely lacking. This occurs in such species as purgatus 

 and thoracicus, and it is certainly possible that it may occur 

 in such species as flavus and flavo-scutellatus. If the single 

 macula in the last should be entirely lacking a specimen 

 would be readily classed in the Genus Eremotylus. Numer- 

 ous records indicate and study of a good series of specimens 

 quickly shows, that the shape and size of the maculae vary 

 considerably within a species, and that apparently little weight 

 can be placed upon these characters. Just how great this 

 variation is can not be determined until extensive breeding 

 experiments have been carried on. 



TRANS. AM. BNT. SOC, XXXVIII. 



