NO. 2279. GEXERA AND SPECIES OF VHALCID-FLIES-GAHAN. 



405 



Fig. 2.- 



-Antenna of male (paraphelinus) centeodora 



SPECIOSISaiMXJS GIRAULT. 



thickened. The antennae in both sexes are more elongate 

 than in Aphelinus with the joints quite differently proportioned. 

 The whole insect is more slender with a somewhat different habitus. 

 These characters taken in conjunction with the difference in host re- 

 lations make it extremely improbable that the two forms represent 

 the same genus. It may be that a close study of many different 

 species will show such an intergradation as to make it impossible to 

 maintain the separation, but for the present, at least, it appears 

 desirable to retain the name 

 Centrodora as distinct from 

 Aphelinus. 



Centrodora, speciosissi- 

 mus has been shown by Mc- 

 Connell to be parasitic in 

 the puparia of Mayetiola 

 destructor Say.^ Girault 

 has recorded it as parasitic 

 in the eggs of Xiphidium, 

 species ?.- 



{Agonioneurus) Centrodora locustarum, was originally reared ac- 

 cording to Giraud from eggs of Xiphidium fuscum Fabricius. 



Foerster's type of the species amoena was collected on a window, as 

 was also the type of speciossissimus Girault. 



Genus TUMIDISCAPUS Girault. 



This genus was originally based on a single male specimen mounted 

 on a slide and now badly crushed. One antenna is however in good 



condition, and is illustrated in 

 figure 3. 



The writer has recently ex- 

 amined a number of specimens, 

 including both sexes, which are 

 in his opinion congeneric but 

 represent a different species. 

 These specimens are made the 

 types of the new species de- 

 scribed below. 



Tu)7iidiscapus, as represented 

 by this new species, is very 

 closely allied to Centrodora, both in structure and habits. The habitus 

 is practically the same ; the wings are elongate and narrow, the vena- 

 tion extending to the middle of the wing; the mesoscutum and scu- 

 tellum are divided by a median longitudinal groove ; the legs are long 

 and rather slender; the abdomen of the female is elongate, acuminate 

 at apex, with the ovipositor strongly exserted. It apparently differs 



Fig. 3.— Antenna of male tumidiscapus flavus 



GIRAULT. 



lAnn. Ent. Soc. Amer., toI. 9, p. 97. 



» Ent. News, vol. 27, 1916, p. 405. 



