Dec, 1914-] Mallock: North American Bezzia. 283 



Halteres black or brown j - 



15. Halteres brown ; third vein extending four fifths of the wing length ; one 



claw on each tarsus with central tooth pulverea Coquillett. 



Halteres black ; third vein extending three fourths of the wing-length ; 



both claws on tarsi with a central tooth dentala n. sp. 



It should be borne in mind that the sexes of many of the species 

 in Ceratopogoninse differ very considerably from each other in color, 

 venation, and leg armature, and in using the above table care will be 

 required to avoid misinterpretation. The females are much more 

 common than the males, and as an indication of this I may mention 

 that only expolita of the genus Bezzia was described from the male 

 alone, while but two others, punctipcnnis and setulosa, were repre- 

 sented by both sexes when the original descriptions were written. It 

 will thus be seen that there is some probability that the synopsis here 

 given will not prove altogether reliable for the identification of males 

 of the described North American species of this genus, but it will 

 serve for the identification of the females. 



Bezzia flavitarsis new species. 



Female. — Shining black. Head black, flagellum of antennae, and the palpi 

 brown. Disc of mesonotum and scutellum glossy black ; pleurae shining, slightly 

 brownish on the lower portions. Abdomen shining black. Legs black, fore 

 femora except the dorsal surface, mid femora narrowly on the ventral surface, 

 fore and mid tibiae at apices, and the entire tarsi of all legs brownish yellow. 

 Wings clear, veins yellow. Halteres black, stems partly yellowish, apices of 

 knobs brown. All bristles and hairs black. 



Eyes distinctly separated, the frons about one fifth as wide as head ; an- 

 tennae slender, last five joints elongated, the entire length of each antenna 

 equal to that of head and thorax combined ; proboscis much shorter than head. 

 Mesonotum with numerous closely placed short hairs ; a group of distinct 

 setulose hairs above and in front of wing base, and two to three in front of 

 lateral anterior angles of scutellum on mesonotum ; scutellum with very weak 

 discal hairs and about eight marginal setulae. Abdominal segments almost 

 bare. Legs of moderate strength, fore femora slightly thickened ; ventral sur- 

 face of fore femora with four to five distinct spines, the other femora unspined ; 

 hind tibiae with the hairs on dorsal surface rather setulose ; basal joint of 

 hind tarsi as long as the next three joints combined; fourth joint about half 

 as long as fifth ; claws equal, rather short, not more than half as long as fifth 

 joint, the latter without ventral spines, both tarsal claws with a distinct tooth 

 on inner surface at middle. Wings with third vein extending three fourths 

 of the wing length ; first vein joining costa very slightly before middle of last 

 section of third; media forking before the cross vein, the base of its posterior 



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