Vol. XXVli] ENTOMOI.OCICAL N KWS. 417 



slender, the fourth almost twice the length of the third, more slender. 



Mesonotum fuscous yellowish, the submedian lines yellowish-orange. 

 Scutellum and postscutellum reddish orange, the former somewhat 

 fuscous. Halteres mostly whitish transparent, pale orange distally. 

 Legs mostly a pale yellowish orange. 



Abdomen deep reddish orange, irregularly fuscous basally; ovipositor 

 yellowish, short, the lobes with a length about three times the \vidih, 

 narrowly rounded apically and thickly setose. 



Type Cecid. 32722. 



This species presents in both sexes, many characters in com- 

 mon with typical species of Retinodiplosis and is noteworthy 

 because the larva has no chitinized tubercles supporting the 

 posterior spiracles. This latter is evidently a modification re- 

 sulting from environmental necessities and would hardly be 

 expected to appear in a species inhabiting seeds and not occur- 

 ring more or less submerged in a pitchy medium. 



A new Cratomus (Hym.). 

 By T. D. A. COCKERELL, Boulder, Colorado. 



The remarkable Pteromalid genus Cratomus was founded by 

 Dalman in 1820 for Cynips megaccphala of Fabricius, which 

 occurs in northern and central Europe. Two years later Dal- 

 man wrote the name Caratomns, the original form having been, 

 we may suppose, due to a misprint or slip of the pen. It is a 

 question which to maintain ; but Ashmead, in his Classification 

 of Chalcid Flies, returned to the original spelling, Cratomus. 



A second species of the genus was described from Britain in 

 1 833 by Walker ; and in 1888 Ashmead described another, 

 C. leucophthalmus, from a specimen collected by Fletcher on a 

 window in Ottawa, Canada. In May of this year I found a 

 specimen on a window in my house in Boulder, Colorado, and 

 as it is evidently distinct from the Canadian species, it may be 

 described as follows : 



Cratomus cancellatus n. sp. 



$. Length about 2.5 mm., robust, with the extraordinary head 

 characteristic of the genus. It differs from C. Icncitf'litliiiliiiiis Ashni. 

 as follows : 



