MAY FLIES AND MIDGES OF NEW YORK 307 



margin of each segment there is a transverse patch of short, fine 

 setae with stout bases. The last segment terminates in a bilobed 

 paddle. The genital sack of the male pupa is longer than that of 

 the female. The specimens of larvae and pupae upon which these 

 descriptions are based w^ere obtained from Mr. Fred Knab. 



Imago, male and female. Black, knobs of the halteres whitish, 

 hairs of antennae brown, those of the body yellowish ; mesonotum 

 somewhat polished, front tibiae twice as long as the first joint of 

 their tarsi, hind tibiae outwardly fringed with rather long hairs, 

 all tarsi with a short pubescence, but without hairs, the fourth 

 joint slender and longer than the fifth; wings grayish hyaline, 

 densely covered with brown hairs, third vein (Ri^^-s) almost 

 straight; length 1.25 to 2 mm. Westfield, Massachusetts. De- 

 scription of the imago from Coquillett ; loc. cit. 



The male genitalia of the type shown on pl.33, figs. 1, 2 and 8. 



Genus 45. Scopelodromus Chevrel 

 Arch, de Zool. Exp. et Gen. 4 ser. 1:1. 190.3. 

 This genus as defined by its author appears to be closely related 

 to or identical with Thalassomyia. Antennae in both sexes seven 

 jointed; the first joint disklike, the second slightly elongate, the 

 third to sixth short and closelv sessile, the seventh ovate and 

 slightly enlarged, its ajiex with a minute button. The palpi are at 

 least as long as the antennae, four jointed; the first joint appear- 

 ing double, mushroom shaped, its stem obconate, short pubescent, 

 its head flattened, discoidal, pilose and provided with setae; 

 the second joint is spherical and with a short pedicel; the third 

 and fourth joints are elongate as in Thalassomyia. The tarsal 

 claws of all the feet of the female, both claws of each hind foot, 

 and the outer claws of the other feet of the male, simple; the 

 inner claw of each fore and middle foot of the male is stouter, 

 flattened, spoon shaped, and from the figure it appears as if the 

 apical margin were scalloped; the empodium pectinate. The apex 

 of the abdomen of the female is provided with a pair of jointed 

 api>endages; the basal joint of each is slender, the second short, 

 obconate, the third disklike, thin, its plane vertical, oval in out- 

 line, its apical margin notched ; male genitalia resembles that of 

 Thalassomyia fusca. The form of the head, eyes, thorax, abdo- 



