MONOGRAPH OF THE NORTH AMERICAN TROCTOTRYriD.E. 247 

 Scelio floridanus, sp. iiov. 



9 . Lengtli, 3 to 3^""". Densely black, snbopaque, with rather coarse 

 reticulated i)unctiires, the thorax with distinct farrows, the postscu- 

 tellnni highly ridged. Antennie brown-black, the scape, legs, and 

 mandibles, yellow; fiiniclar joints transverse, the club large fusiform, 

 wider than long; angles of metathorax prominent. Wings subhyaline, 

 the venation yellowish, the submarginal vein ending in a slight stigma 

 and an oblique stigmal vein, the latter with an indistinct radius. 

 Abdomen fusiform, lineatedly rugose; first segment transverse-quad- 

 rate of an equal length with the fifth, the second, longer, the third, 

 the longest segment, the fourth shorter than third, the sixth, vsub- 

 equal with the fifth, the seventh much shorter; the venter polished, 

 the segments striated towards apex. 



Habitat. — Haw Creek and Jacksonville, Fla. 



Types in National Museum and Coll. Ashinead. 



Subfamily VI.— PLATYGASTEEIN^. 



Head transverse, rarely quadrate. Ocelli 3, triangularly arranged. 

 Mandibles bifid at tips. Maxillary palpi 2-jointed; labial jjalpi 1- 

 jointed. Anteniue elbowed, clavate, most frequently 10-jointed in both 

 sexes, rarely 8 or 9-jointed, inserted at the base of the clypeus. Pro- 

 notum never very large, scarcely visible from above, mesonotum most 

 lie(|uently transverse, Avith or without furrows; scutellum variously 

 shaped, often with an awl-shaped tip or spined, flat, semicircular or 

 pillow-shaped; metathorax short, with a median sulcus. Front waugs 

 most fre(iuently entirely veinless, or with a submarginal vein termi- 

 nating in a stigma before attaining the costa, the basal nervure rarely 

 present; hind wings lanceolate, veinless. Abdomen petiolate or sub- 

 l)etiolate, ovate, oblong-oval or conic-ovate, depressed, very rarely 

 greatly elongate, usually composed of 6 visible segments and always 

 carinated at the sides, the second segment the longest. Legs long, 

 the femora and tibia? clavate, the tibial spurs 1, 1, 1, the tarsi, except 

 in a- single genus, Tphetrachelus, 5-jointed, the claws simple. 



A very large and extensive group, at one time classified with the 

 Scelionina'j but readily distinguished by the 10-jointed clavate an 

 tennie, the 2-jointed maxillary palpi, 1-jointed labial palpi, and the 

 bitid mandibles; the wings, except in a few genera, being entirely vein- 

 less and wholly different from the Scelionina?. 



The group is divided into numerous genera, the species of which con- 

 fine their attacks almost exclusively to the Dipterous families Cecido- 

 myiidic and Tipulidse, the only records conflicting being two recorded 

 by liatzeburg. Plafi/f/asfer contort icor ids Ratzb. is said to have been 

 bred from Tortrix strohilana and P. mucronatus Ratzb. from Tortrix 

 resinana. 



