1916.] NATURAL SCIENCES OF PHILADELPHIA. 529 



shows that the species is distinct. It serves to connect the gen- 

 eralized caudata with the specialized members of the subgenus 

 {flava, parva). The small cell R 2 and the elongate cell 1st .1/, with tin- 

 short, divergent veins issuing from it, and the basal deflection of 

 Cui inserted at nearly midlength of it serve to separate the form 

 from caudata. This latter species is described and figured in a 

 publication that is not readily accessible to the student, and its 

 venation is shown on Plate XXVII, fig. 42. With caudata this new 

 species agrees in the possession of the radial cross-vein, but this is 

 here very faint and evidently in process of being eliminated. In 

 R. flava (Plate XXVII, fig. 43) the cross-vein is lacking. 



In regard to the genus Rhabdomastix Skuse it will be noted that 

 Kertesz gives the date of Skuse's paper on the Limnobinse as 1890; 

 the first separates of this article are dated September 25, 1889, and 

 it is this date that has been adopted. 



PTEROCHIONEA gen. n. 



Palpi short, four-segmented, the segments • subequal. Antennse 

 11-segmented, the first segment of the scape longer than the second; 

 second segment narrow-subglobular, not strikingly wider than the 

 adjacent segments; first segment of the flagellum elongate, tapering- 

 slight ly to the tip, formed by the fusion of five segments as determined 

 by the verticils, near the tip with a faint suture that passes about 

 half-way across the segment on the verticillate side; segments four to 

 ten moderately elongated, cylindrical, truncated at both ends (Plate 

 XXXI, fig. 93) with a strong series of verticils; terminal segment 

 formed by the fusion of two segments as determined by the verticils. 

 Wings moderately broad (Plate XXVII, fig. 44); Sc moderately elon- 

 gated ending just beyond the end of Rs, Sc 2 at its tip; Rs long, strongly 

 arcuated at its origin; cross-vein r present; cell 1st M z elongate, the 

 deflection of M 3 over twice the length of the median cross-vein; cell 

 Mi present; basal deflection of Cui at the fork of M; second anal vein 

 short, ending before the origin of the sector. Legs hairy, not incras- 

 sated; tibiae without spurs. Male hypopygium powerful (Plate 

 X XXI. fig. 94), suggesting the Chionea type, the pleural pieces stout, 

 cylindrical, with a strong pleural appendage, somewhat curved, nearly 

 as long as the pleurites; ventral lobe small, rounded, hairy. 



Genotype. — Pterochionea bradleyi sp. n. (Western Nearctic region.) 



This new genus is closest to Crypteria Bergroth 10 of the northern 



Pahearctic region in the curious fusion of the five basal segments of 



10 .Ada Soc. pro Faun. <t Fl<>r. Finn., vol. 37, Xo. 6, pp. 3-7, figs. 1-4 (1913). 



