MAY FLIES AND MIDGES OF NEW YORK 165 



seven to nine toothed labium. Thoracic and anal prolegs 

 present, the latter with prominent retractile claws (fig.22). The 

 caudal papillae are cylindrical, pointed apically, each with three 

 short and three long setae. (Plate 34, figs. 21, 22, 23.) 



Genus 27, Limnophyes Eaton 

 Ent. Monthly Mag. 60. 12. 1875. (P1.37, figs. 1, 2, 3, 4) 



Imago. Head small, ovately triangular; eyes roundly oval, 

 hardly reniform; ocelli absent; antennae divergently porrect, 

 filiform, 6-jointed, with sparse verticils of spreading hairs (fig.3), 

 the basal joint very stout, the second much smaller than the first, 

 but yet slightly thicker than the remaining joints, which are of 

 even width, the apical joint as long as the preceding two together; 

 mouth short, the margin hairy, palpi 4-jointed (fig.2). Thorax 

 robust, above arched anteriorly and produced like a hood over 

 the head (fig.4) ; its contour viewed from ajbove is somewhat 

 ovate, and it has about four longitudinal rows of short, fine, sparse 

 hairs ascending upwards and inwards; scutellum moderately 

 large, prominent, semicircular or roundly subquadrate. Wings 

 oblong (fig.l), suddenly constricted at the ibase, rather straight 

 along the costa, the apex almost parabolic, the margins ciliated. 

 The subcostal vein very short, becoming obsolescent in the sub- 

 costal area, the radius two-branched, R extending beyond the 

 middle of the costa, the media united by a crossvein to the radius 

 just proximad of the point of furcation; R 4 ^ 5 like R^ accompanied 

 by a slight crease in the membrane ; the cubitus rather deeply 

 forked, the furcation acute, similarly accompanied by a crease 

 which follows its lower branch ; this last branch is succeeded by 

 one or two longitudinal folds simulating additional veins (anal 

 veins ?). Halteres large. Legs slender, with fine short hairs; 

 tibiae almost scabrous, with a minute spine at the apex interiorly ; 

 the first tarsal joint much longer than the next. Abdomen slen- 

 der, 8-jointed, with a few hairs above; ovipositor formed of two 

 very short lamellae. Larvae not observed. 



In the original diagnosis it was stated that the numiber of 

 joints in the palpi and abdomen were respectively 5 and 7. It 

 appears to be more correct to regard them as toeing 4 and 8 

 jointed. The antennal joints are very likely to vary in number 

 with the sex, and to be more numerous in the male than in the 

 female. 



