1921] NATURAL SCIENCES OF PHILADELPHIA. 51 



the pleural appendage powerful, shaped somewhat like the head 

 and neck of a bird of prey. 



Male. — Length about 5 mm. , wing 6 mm. 



Rostrum and palpi dark brown. Antennal scape dark brownish 

 black, flagellum broken. Head dark, gray pruinose. Mesonotum 

 light reddish yellow, the praescutum and scutum unmarked with 

 darker as in the three other species of this group described at this 

 time. Pleura yellowish testaceous, the dorsal sclerites a little darker. 

 Halteres brown. Legs with the coxae and trochanters pale testa- 

 ceous, remainder of the legs brown, the femora paler basally. Wings 

 with a brownish tinge; stigma oval, darker brown; veins dark brown. 

 Venation: Sc long, Sci ending far beyond midlength of Rs, Sd 

 near the tip of Sci; basal deflection of Cui some distance before 

 the fork of M, this distance slightly variable. Abdomen dark 

 brown, the sternites paler. Male hypopygium (Plate IV, fig. 12) 

 very distinct from the other species of the group; pleurites very 

 short and stout, on the proximal face near the base with a very 

 stout lobe that is slightly enlarged and bifid at its outer end and 

 here provided with several powerful bristles. Pleural appendage 

 very large and powerful, shaped somewhat like the head of a bird 

 of prey, the short curved apex being the beak, the neck region pro- 

 vided with dense acute spines. Gonapophyses appearing as flat- 

 tened blades, the lateral angles produced laterad into a conspicuous 

 cylindrical lobe, the apex blackened. 



Habitat.— Pern. 



Holotype, cf , Yurimaguas, April 6, 1920 (H. S. Parish). 



Paratopotype, d", March 31, 1920. 



Dicranomyia acuminata sp. n. Plate IV, fig. 9. 



Antennae black, the flagellar segments provided with an apical 

 pedicel; head dark, yellowish gray pruinose; mesonotal praescutum 

 reddish yellow with three dark brown stripes that are not conflu- 

 ent; wings with Sc long; male hypopygium with the pleural append- 

 age produced proximad into a long, tapering point. 



Male. — Length 5 mm.; wing 6.1 mm. 

 Female. — Length 6.2 mm.; wing 6 mm. 



Rostrum and palpi dark brown. Antennae rather long for a 

 member of this genus, black; each flagellar segment with a moder- 

 ately long apical pedicel; flagellar segments covered with a con- 

 spicuous white pubescence, the pedicels glabrous. In the female, 

 the antennae are shorter, the flagellar segments without the apical 

 pedicels. Head dark, yellowish gray pruinose. Pronotum reddish 

 yellow, dark brown medially. Mesonotal praescutum reddish yellow 

 with three conspicuous dark brown stripes, the median one becoming 

 obliterated far before the suture; scutum obscure reddish, the lobes 

 dark brown; remainder of the mesonotum dark brown. Pleura 

 obscure reddish brown, sometimes a little darker. Halteres dark 



