940 Charles Paul Alexander 



moderately large; apical point elongated, slender; ventral cutting edge with three flattened 

 teeth, gradually smaller from outermost toward base; outermost tooth flattened, a little 

 enlarged distally, about as long as apical point; basal tooth small, acute; a prosthecal append- 

 age with a brush of hairs beneath it. 



Pupa.' — Length of cast pupal skin, about 5.5 mm. 



Cephalic crest of two prominent lobes, blunt at tips, their surface granulated. Labial 

 lobes blunt at tips. Sheaths of maxillary palpi moderately stout, tapering suddenly to sharp 

 apices. Antenna with basal segment very angulated. Pronotal breathing horns (Plate 

 LXXVI, 408 and 409) massive, short, trumpet-shaped, flattened laterally, and here margined 

 with an elevated ridge, along which are scattered the rows of breathing pores; mouth of this 

 trumpet wide. On thorax between breathing horns, large, rounded lobes which are minutely 

 granulated. Declivity of mesonotum (Plate I.XXVI, 407) somewhat precipitous, at the 

 rather narrow crest with about six small tubercles which are densely beset with spicules; 

 along shoulder a similar, but more elongate, transverse welt; lateral margin of thorax before 

 wing root projecting out as a sharp angle with a seta at its base. Wing sheaths reaching 

 end of second abdominal segment. Leg sheaths moderately long, attaining base of fourth 

 abdominal segment; fore legs a very little longer than hind legs; middle legs much shorter, 

 ending just beyond base of last tarsal segment of fore legs. 



Abdominal segments divided into two narrow basal rings and a much broader posterior 

 annulus. Armature of abdomen very weak. Male cauda (Plate LXXVI, 410 and 411) small, 

 elongate; ventral lobes a Httle longer than the short, blunt dorsal lobes; on dorsal face near 

 end of eighth segment, two stout lobes pointed at the tips which are directed dorsad and 

 slightly caudad; eighth segment -ndth a close pentagon of pale, slender lobes, the posterior 

 pair larger and closer together than the anterior pair, the median lobe the smallest. 



Ncpionotype. — Sacandaga River, Fulton County, New York, June 5, 1914. 

 Nernoti/pe. — With type larva. 

 Paratypes. — Two larvae with type. 



(Subgenus Gonomyia Meigen) 



Gonomyia {Gonomyia) sulphurella O. S. 



1859 Gonomyia sulphurella O. S. Proc. Acad. Nat. Sci. Phila., p. 230. 



1869 Goniomyia sulphurella O. S. Mon. Dipt. N. Amer., part 4, p. 180-18L 



Gonomyia sulphurella is a handsome little crane-fly which is very 

 common and widely distributed thruout the eastern and central United 

 States. Larvae are not infrequent in mud along the banks of streams. 

 The writer has bred this species from larvae sifted from sandy mud from 

 the banks of Cascadilla Pond, Ithaca, New York, where they occur 

 associated with numerous larvae and pupae of a tabanid (Chrysops itidiis 

 (). S.), a stratiom\iid {Odontomyia sp.), and other forms. Larvae collected 

 on May 14, 1913, emerged as adults on June 1. Adults have been reared 

 as late as October 19 by E. A. Richmond. 



