Parasitic Hymenoptera from the Illinois River. 275 



as the head and thorax united, polished, the first sepj- 

 ment not longer than wide, with an elevation above at 

 base, the second segment the longest, 'twice as long as 

 wide at apex, the suture between it and the first striated, 

 the third segment hardly half as long as the second, 

 the fourth about two thirds the length of the third, the 

 three following forming a cone of which the fifth is very 

 short, its apical margin with a median sinus, the sixth 

 twice as long as the fifth, the seventh ver3^ short, scarcely 

 discernible; sheaths of ovipositor a little prominent. 



(^.— LeEgth 0.8 mm. Black, but with the head, pros- 

 ternum, and legs testaceous; the antennae 12-jointed, 

 brown-black, with all the joints of the flagellum, except 

 the pedicel and the last joint, small, moniliform, joints 

 3 to 5 increasing in size but smaller than pedicel, joints 

 6 to the penultimate a little wider than long; abdomen 

 not, or only slightly, longer than the head and thorax 

 united, the genitalia long, exserted, curving downwards. 



Hah. — Havana, 111. 



Types in collections of the Illinois State Laboratory 

 of Natural History and in ray collection. 



Described from 11 cf and 9 2 specimens bred from 

 the eggs of a common horse-fly, Tabanus atratus Fabr. 



In my recent monograph of the N. A. Proctotrypidae, 

 pp. 140-141, I characterized four species belonging to 

 this genus, none of which, however, are closely allied to 

 the present species. On the contrary, it appears to 

 resemble more closely three European species described 

 under the genus Telenomus, viz.: Telenomus othus Hal., 

 T. laricis Hal., and T. tabani Mayr. 



Dr. Gustav Mayr, in his excellent revision of the 

 European species of Telenomus* did not recognize the 

 validity of Thomson's genus Phanurus. 



As defined in my monograph, however, I believe it 

 can be readily separated from Telenomus, although both 

 Haliday and Walker have described Telenomi which 



*"Ueber die Schlupfwespengattung Telenomus." Verb.d. Ic k. zool. boL G*> 

 in Wien, 1877, pp. 687-714. 



