ashmead:. classification of the chalcid flies 329 



Tribe II. Pachyneurini. 



In this tribe the antenna) are inserted near the middle of the face, and the 

 marginal vein in the front wings is always thickened and usually short. 



The species, like the Asaphini are said to be parasites of coccids and aphids, but 

 these insects have other hymenopterous parasites, braconids, encyrtids, cyiiipids, 

 etc., and the Pachyneurini are probably hyperparasites of these insects. 



A few have also been bred from dipterous insects belonging to the family 

 Syrphidse, which also have other hymenopterous parasites, and this seems to con- 

 firm the hyperparasitism of these insects. 



TABLE OF GENERA. 



1. Females , 2 



Males 7 



2. Mesothoracic furrows distinct, complete 3 



Mesothoracic furrows incomplete, indicated only anteriorly 4 



3. Stigmal vein with a large knob ; abdomen ovate, pointed at apex, the second segment large, the third 



segment very short, the fourth and fifth rather large, subequal, the following very short. 



Pachycrepis Forster (type Caruna clavata Walk.). 

 Stigmal vein with a small knob ; abdomen ovate, the second and the third segments large, the fourth 

 and fifth very short, the sixth and seventh longer. 



Pachycrepoideus Ashmead, g. nov. (type P. dubius Ashm.). 



4. Abdomen above flat or depressed 5 



Abdomen above convexly rounded 6 



5. Pronotum much narrower than the mesonotum across the shoulders ; abdomen oval or short ovate, the 



second segment the longest, occupying a good portion of the .surface, the third and fourth short, nearly 



equal, the following very short Pachyneuron Walker (type P. formosum Walk.). 



Pronotum as wide as the mesonotum across the shoulders ; scutellum with a cross-furrow just before the 

 apex ; abdomen seen from above ovate, nearly as long as the head and thoiax united, beneath com- 

 pressed or keeled, the ventral valve prominent, plowshare-shaped, the second segment fully twice as 

 long as the third, or longer, the fourth a little longer than the third, the following subequal, the sixth 

 as long or a little longer than the fifth Euneura W^alkei' (type E. auganis Walk.). 



6. Pi'onotum narrower than the mesothurax ; scutellum without a cross-furrow before apex ; abdomen ovate, 



the second segment the longest, the third, fourth and fifth not short, subequal, the fourth a little the 

 longest, the sixth about one third shorter than the fifth. 



Hypsicamera Forster (type H. ratzeburgii Reinhard).- 



7. Mesothoracic furrows incomplete, indicated only anteriorly 8 



Mesothoracic furrows complete. 



Stigmal club large Pachycrepis Forster. 



Stigmal club small Pachycrepoideus Ashmead. 



8. Pronotum as wide as the mesonotum ; scutellum with a cross-furrow before the apex. Euneura Walker. 

 Pronotum narrower than the mesonotum ; scutellum without a cross-furrow before apex. 



Metanotum rather short ; funicle joints not more than twice as long as thick. 



Pachyneuron Walker. 

 Metanotum long ; funicle joints thrice as long as thick Hypsicamera Forster. 



