10 PROCEEDINGS OF THE NATIONAL MUSEUM vol.69 



impressed, smooth; the middle mesonotal lobe shallowly impressed 

 down the middle; fossa in front of scutellum very broad and deep, 

 entirely polished, and with a median carina bisecting it; scutellum 

 polished; propodeum aerolated, shining; the median area long and 

 narrow, acute at base; posterior face of propodeum abruptly decliv- 

 ous, separated from the dorsal face by a sharp transverse carina; 

 pleura polished; mesopleural furrow shallow, not foveolate; posterior 

 femora short and unusually broad; posterior tibiae stouter than 

 usual, sloping off rather strongly on the outer side of the apex, above 

 the terminal spurs, and here provided with an exceptionally large 

 number of conspicuous short stout spines, there being more than 

 forty of these spines on each hind tibia; inner spur of posterior tib- 

 iae much longer than the outer and nearly half as long as the basi- 

 tarsus; apical segment of posterior tarsi stout and about as long as 

 the second tarsal segment; claws cleft; wing venation essentially 

 as in vulgaris; abdomen as long as head and thorax, narrower than 

 the thorax, entirely smooth and polished. Head entirely black; 

 antennae and palpi black; thorax dark ferruginous, with the venter, 

 the prothorax except more or less of the propleura, the mesopleura 

 entirely, and the middle mesonotal lobe anteriorly black; wings 

 strongly infumated; anterior and middle legs wholly black; posterior 

 legs red, their trochanters and tarsi black; abdomen entirely red. 



Type. — In the collection of the University of Ilhnois. 



Type locality. — Baboquivari Mountains, Pima Company, Arizona. 



Described from two male specimens collected July 27-31, 1923, by 

 O. C. Pohng. Through the kindness of Dr. T. H. Frison, curator of 

 the insect collection at the University of Illinois, the paratype, which 

 is practically a duplicate of the t5rpe, has been deposited in the United 

 States National Museum, and has been given Catalogue No. 28689. 



Genus AENIGMOSTOMUS Ashmead 



Aenigmostomus Ashmead, Proc. U. S. Nat. Mus., vol. 23, 1900, p. 128. Geno- 

 type. — Microdus longipalpus Cresson (Monobasic). 



This genus is based upon the remarkable form of the maxillary 

 palpi, which are modified to form a 5-segmented hollow beak that it 

 usually about as long as the head and thorax. This character alone 

 will separate the group from all other genera in the Braconinae. 



Head transverse, strongly hollowed out behind ; eyes moderately 

 large; malar space less than half the length of eyes; face rather nar- 

 row, but about as broad as long from antennal foramina to apex of 

 clypeus; labial palpi very slender; mandibles short, the tips not quite 

 meeting, bidentate, the teeth short; labrum large; clypeus long, con- 

 vex, only a little broader than long; frontal impressions not mar- 

 gined by carinae; antennae slender; thorax long and narrow; parap- 

 sidal furrows finely impressed, usually not distinct anteriorly; scu- 



