so. 1838. THE DIPTEROUS FAMILY PEORIDJE—MALLOCH. 443 



on basal two-thirds, then narrowed to apex which is truncate, the two 

 projecting organs giving it an acutely pointed appearance; legs 

 yellow, spurs on posterior four tibiae minute, of equal length on both 

 pairs ; hind femora with a fringe of soft hairs on their vental surface ; 

 hind tibia delicately setulose ; wings with the costa decidedly short of 

 middle, first section about three times as long as second, fork of third 

 vein hardly visible except with a high power, fringe very long on 

 tip half of costa, short at base, consisting of about 10 bristles; fourth 

 vein leaving third with a hardly preceptable curve running nearly 

 straight to tip of wing, ending with a slight downward curve, seventh 

 vein distinct; halteres yellow. 



Length, 1| mm. 



Localities. — Brownsville, Texas, May 7, 1904 (H. S. Barber). A 

 manuscript label, "Flying erratically over ants, Esperanzo Ranch 7-5' ' 

 is also on the pin, but no note of the species of ant it was attending. 



Type.— C&t. No. 14835, U.S.N.M. 



APOCEPHALUS COQUILLETTI, new species. 

 Plate 38, fig. 4. 



This is the species Brues described and figured as pergaridei Coquil- 

 lett.* It is quite distinct in the shape of the ovipositor from that 

 species which is correctly figured and described by Coquillett,- and to 

 Brues's description I would only add that like pergandei it has four 

 scutellar bristles, the anterior pair much reduced and the spurs on the 

 hind tibiae are only half as long as those on the mid tibiae. I found a 

 single specimen in the collection here with the manuscript labels " 54 15, 

 chasing Camponotus " and ^'Phora sp. ? " On reference being made to 

 the diary it was discovered that the specimen was received June 8, 

 1912, from P. C. Newkirk, Jalapa, Tennessee. I have seen the speci- 

 men mentioned by Brues from Franldord, ^Pennsylvania, with speci- 

 men of C. pennsylvanicus on card, and it is identical with that from 

 Tennessee. I accordingly have named this species coquilletti in 

 honor of the late Mr. D. W. Coquillett, who first described the genus. 

 Brues records the Texan specimen as attacking Camponotus macu- 

 latus, var sansaheanus Buckley. 



Type.—Csit. No. 14836, U.S.N.M. 



APOCEPHALUS PERGANDEI CoquiUett. 

 Plate 38, figs. 3, 6, 10, and plate 41, fig. 6. 



This species is represented in the collection by eight specimens, 

 five, from which the original description was drawn, with the locality, 

 Cabin John Bridge, Maryland, and three from Washington, District 



» Trans. Amer. Ent. Soc, vol. 29, p. 373. 2 Proc. Ent. Soc. Wash., vol. 4, 1901, p. 501. 



