18 PEOCEEDINQS OF THE NATIONAL MUSEUM vol. 81 



Male with small claws and pulvilli; genitalia yellow; a small 

 blackish spot at hind edge of third and fourth abdominal segments. 



Length of male, 5.5 mm ; of female, 5.6-7 mm. 



Ty^e.— Male, U.S.N.M. No. 43062. 



Remarks. — Described from 3 males and 10 females, all but one of 

 which were reared from the sugarcane borer, Diatraea saccharalis 

 Fabricius, at Tucuman, Argentina. Eleven were reared by H. A. 

 Jaynes and one by H. E. Box. The other specimen was collected 

 by H. H. Smith at " Piedras B.," Brazil, in April ; it belongs to the 

 collection of the American Museum of Natural History, to which it 



is returned. 



SCHISTOCHILUS, new genua 



Runs to Atractochaeta Brauer and Bergenstamm in Stein's 1924 

 " Key to the Central European Tachinidae," ^ but differs in numer- 

 ous characters. Eyes bare, head in profile almost triangular, the 

 length at vibrissae being less than one-half of that at antennae. 

 Front long, almost horizontal, in male a little more than one-third 

 the head width; face much receding, longer than front; third an- 

 tennal joint elongated, four times the second, its upper edge straight, 

 lower rounded forward at the apex, the sharp tip in line with upper 

 edge. Parafacial bare, as wide as third antennal joint; facial ridges 

 bristly on lower third. Clypeus deeply depressed, forming a single 

 groove for the reception of the antennae, which are out of sight in 

 profile when depressed; the groove continues to the mouth through 

 epistoma. Arista bare, shorter than the third antennal joint, very 

 thick and blunt, the terminal joint shorter than the preceding one. 

 Proboscis short and small, palpi rather small. Cheek two-fifths 

 of eye height. Outer vertical small, inner large, not decussate. 

 Ocellars of ordinary size, proclinate and diverging. Frontals in 

 a single row, one upper reclinate, the lowest at about the middle of 

 the second antennal joint. One proclinate orbital in male. Proster- 

 num with a row of black setules on each side, propleura bare. Scu- 

 tellum with two pairs of laterals, the apicals small, depressed, not 

 decussate; postscutellum well developed, but joined rather closely 

 to the scutellum so that the transverse groove below it is much 

 deeper than the one above. Abdomen of ordinary length, wider 

 beyond the middle than the thorax, no discal bristles. First vein 

 of wing bare, third with a single bristle at base. First basal cell 

 narrow, the anterior cross vein short ; apical cell widening uniformly 

 to bend, which is rectangular and slightly rounded ; apical cross vein 

 erect, joining third vein before the tip, the petiole more than one- 

 third as long as the cross vein and ending far before wing tip. 

 Squamae bare, rounded, not very large. 



Genotype. — Schistochilus aristatum., new species.^" 



•Arch, fiir Naturg., vol. 90A, p. 19, 1924. 



"The genus is of neuter gender, derived from the Greek oheiloa (lip). 



