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1J4 Bulletin of the Brooklyn Entomological Society Vol. XII 



below the base of the wing. Recent attempts at a classification 

 of the order have shown a tendency towards the use of the chseto- 

 taxy of the pleurae as a distinguishing character in separating 

 the families Muscidse and Anthomyiidse. If the absence of 

 bristles or hairs from the hypopleura and pteropleura separates 

 Anthomyiidse from Muscidse, then many typical species of the 

 former family will require to be placed in Muscidse. Besides the 

 genus now under consideration the genus Lispa (subfamily 

 Lispinae), several species in Phaonia, and at least one in Erem- 

 omyia have hairs or bristles either on the hypopleura or ptero- 

 pleura. The presence or absence of these hairs or bristles, while 

 of considerable importance in a general way, does not invariably 

 serve as a basis for the separation of the families Anthomyiidse 

 and Muscidse. 



Emmesomyia gen. nov. Generic Description: Male. — Eyes very large, 

 separated by a narrow stripe consisting of the orbits only on the upper 

 half of its length ; ocellar bristles long, directed forward. Abdomen nar- 

 row, slightly flattened ; hypopygium of moderate size, terminating in a 

 recurved hook-like process ; apical ventral segment deeply excised cen- 

 trally; first segment with very strong bristles on middle laterally. Legs 

 and wings similar to those of female. 



Female. — Eyes separated by one third the head width ; cruciate frontal 

 bristles present ; orbitals 5 in number, the median one directed forward ; 

 antennae elongate, third joint much longer than second, rounded at apex; 

 arista hairy; proboscis and palpi normal. Thoracic chsetotaxy similar to 

 that of Hylemyia, differing only in having a strong bristle on the upper 

 margin of the pteropleura. In other respects similar to Hylemyia except 

 that the third vein has several setulse at base, both above and below. 



Type, Emmesomyia unica, n. sp. 



Emmesomyia unica n. sp. Female. — Black, densely covered with pale 

 gray pruinescence. Frons and face with dense whitish pruinescence, that 

 on orbits slightly silvery; antennae black, basal 2 joints rufous; apical por- 

 tion of proboscis glossy black; palpi yellow. Mesonotum slightly yellow- 

 ish behind humeri, and with 4 blackish vittae on the anterior portion of 

 disc, the inner pair rather widely separated, narrower than the outer pair 

 and not extending caudad of suture; center of disc with a distinct yel- 

 lowish longitudinal streak, scutellum yellowish at apex. Abdomen with 

 basal segment yellowish on each side of dorsum and usually some yellow 

 markings on some of the other segment's. Legs reddish yellow, mid and 

 hind legs with the coxae and tarsi infuscated. Wings clear. Squamae 

 white. Halteres whitish yellow. 



