1916.] NATURAL SCIENCES OF PHILADELPHIA. 529 
shows that the species is distinct. It serves to connect the gen- 
erahzed caudata with the spcciahzcd members of the subgenus 
(flava, pcirva). The small cell R, and the elongate cell 1st AU with the 
short, divergent veins issuing from it, and the basal deflection of 
C^^l 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 Rhahdomastix 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 sul^equal. Antennae 
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 
slightly 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 l^y 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, Sd at its tip; Rs long, strongly 
arcuated at its origin; cross-vein r present; cell 1st M^ elongate, the 
deflection of Mi over twice the length of the median cross-vein; cell 
Ml 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; tibise without spurs. Male hypopygium powerful (Plate 
XXXI, 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^" of the northern 
Palsearctic region in the curious fusion of the five basal segments of 
10 Acta Soc. pro Faun, et Flor. Fenn., vol. 37, No. 6, pp. 3-7, fig.s. 1-4 (1913). 
