912 CHARLES PAUL ALEXANDER 



water in shaded woods. The pupal duration of the latter species is not 

 more than ten days. Keilin (1913:4) notes the presence of hypodermal 

 glands in larvae of M. bifilatus Verr., but does not mention the larval 

 habitat. Of the American species, M. hirtipennis has been reared from 

 similar situations. 



Molophilus hirtipennis (O. S.) 



1859 Erioptera hirtipennis 0. S. Proc. Acad. Nat. Sci. Phila., p. 228. 



The little dark-colored crane-flies of the species Molophilus hirtipennis 

 are common on vegetation in shaded woods in spring and early summer, 

 or they may be found in small dancing swarms in similar situations. 



The larvae are exceedingly abundant in wet organic mud or in cool, rich 

 woods in the neighborhood of streams or springs. The writer has reared 

 the species very frequently from specimens found in Needham's Glen 

 and on Bool's hillside, Ithaca, New York, in April and May, 1914 to 

 1917. The pupal period is probably about a wrck, but in all the rearings 

 of the writer this could not be ascertained closer than ten days. 



Larva. Length, 9-10 mm. 



Diameter, 0.4-0.5 mm. 



Coloration light yellow. 



Form long and narrow; body terete, noticeably constricted before spiracular disk (Plate 

 XLV, 344). Integument covered with a delicate appressed pubescence and a few transverse 

 rows of very short, erect setae. Spiracular disk (Plate LXV, 351) squarely truncated, sur- 

 rounded by five subequal lobes; ventral lobes on inner face with two heavy black parallel 

 lines, separated by a capillary yellow line; lateral lobes with a similar double line running 

 inward far beyond spiracle; these double lines not connected at distal end; dorsal lobe with 

 a single oval black mark which is less intense outwardly; a black mark beginning at spiracle 

 running proximad toward center of disk; lobes with a few short hairs at tips. (There is a 

 little variation in the degree of intensity, but the general pattern is as described above.) 

 Anal gills four, short and blunt. 



Head capsule (Plate LXV, 345) long, narrow, consisting of six chitinized rods, the ventral 

 rods broad and flat, at the anterior end expanded to form the mental plates (Plate LXV, 346), 

 each rod contributing four teeth, of which the outermost is bluntly rounded, the middle pair 

 the largest and subequal. Dorsal bars two on either side, one slender, at their anterior 

 ends articulating with a transverse chitinized rod; the various bars connected by a thin 

 membranous tissue. Labrum and epipharynx elongate, narrow, occupying the space between 

 mandible and antenna on either side, the ventral face with abundant long hairs, on sides 

 margined with numerous long, incurved, flattened setae. Mental plates as described above; 

 behind them the hypopharynx (Plate LXV, 347), consisting of a semicircular cushion provided 

 with dense, short setae. Antennae (Plate LXV, 348) rather closely approximated on dorsum, 

 prominent, each 1-segmented but bearing a long apical papilla; basal segment moderately 

 elongated, cylindrical, the apex obliquely truncated, the papilla hyaline, gradually narrowed 



