THE CRANE-FLIES OF NEW YORK PART II 927 



Ormosia nigripila (O. S.) 



1869 Rhypholophus nigripilus O. S. Mon. Dipt. N. Araer., part 4, p. 142. 



The larvae of Ormosia nigripila are common in rich organic mud in 

 shady places. Larvae found in Needham's Glen, Ithaca, New York, 

 on March 27, 1914, emerged on April 18. Other larvae from Coy Glen, 

 found on April 17, emerged on May 1. At Orono, Maine, large larvae 

 were found on July 14, 1913, and were placed in rearing, emerging on 

 the 26th as adult males. This limits the pupal duration to not more than 

 two weeks, but it is undoubtedly much less, probably not more than a 

 few days or a week. 



Pupa. Length, 5.2 mm. 



Width, d.-8., 0.9 mm. 

 Depth, d.-v., 1 mm. 



Head, thorax, and appendages light brown, becoming darker in maturity; breathing horns 

 and abdomen pale whitish. 



Cephalic crest with lobes small, low, and rounded, with a powerful seta at tip, directed 

 forward. Labrum blunt at apex. Labial lobes large, subtriangular, lateral angles obtusely 

 pointed. Sheaths of maxillary palpi stout, rather elongate. Pronotal breathing horns 

 (Plate LXXII, 384) rather short and flat, compressed, slightly expanded beyond base; outer, 

 or posterior, margin with about five small tubercles, at least one of which is setiferous. 

 Mesonotum very steep and precipitous, as in this group of species; crest (Plate LXXII, 383) 

 tumid, extensive, on either side with abundant coarse yellow bristles; caudad of these, four 

 stout setae in a quadrangle, two on either side of median line; lateral angles of thorax with 

 two stout setae; a strong seta just above wing base. Wing sheaths reaching base of third 

 abdominal segment. Leg sheaths modsrately long, extending almost to midlength of fourth 

 abdominal segment; tarsi of middle legs much shorter than the others, hind legs a very little 

 longer than fore legs. 



Abdomen with segments (Plate LXXII, 385) before their caudal margin bearing transverse 

 rows of slender spines; pleura with a small area lying a little cephalad of tergal and sternal 

 rows and margined behind with eight to ten spines. Spiracles distinct, tubular. Setae 

 as follows: on pleura, a seta on anterior annulus, a stout seta just ventrad of spiracles, and 

 a third lying a little ventrad and cephalad of spiracle; on sternites, two stout setae near 

 base of posterior annulus; on tergites, two setae on posterior annulus, lying transversely 

 at level of spiracle, and a third seta just cephalad of end of row of spines. Male cauda (Plate 

 LXXII, 386) with ventral lobes rather slender, narrowed outwardly, and somewhat pointed 

 at apex; dorsal lobes curved strongly backward, terminating in acute, chitinized points 

 with a strong seta on outer face before tip and a second seta nearer base; dorsum of segment 8 

 with five brown, chitinized lobes which are crowned at their apices with a circlet of spines; 

 posterior pair the longest and stoutest, broad at base, more slender outwardly, with a large 

 lateral spine and about three smaller inner sp'nes; anterior pair more slender; median lobe 

 slender, crowned with a circlet of about six small, subequal spines. Female cauda (Plate 



