MAY FLIES AND MIDGES OF NEW YORK 269 



4. Orthocladius (?) oceanicus Packard 



1869 Chironomus Packard. Proc. and Commun. Essex Inst 6 : 42 

 1878 Chironomus Ost. Sack. Cat'l. Dipt, p.21 



Larva. It is pale whitish in color, the thoracic rings being 

 tinged on their harder parts with green. It is .22 to .25 of an 

 inch in length. The labium is somewhat triangular and multiden- 

 tate on the anterior side. This larvae differs from fresh-water 

 larvae of the same genus from Lake Champlain in not having the 

 three-jointed filamentous appendages inserted just above the anal 

 leg-s. The pair of anal legs is well-developed, and terminates in 

 a single crown of hooks, which can be retracted entirely out of 

 sight. In the fore legs the hooks are much more numerous and 

 arranged in longitudinal rows, about twenty-five in number; those 

 on the upper side of the tip being much the largest, those at the 

 base being minute (pl.34, figs. 17, 18, 19). 



Pupa. There are no thoracic filaments, nor is the abdomen 

 terminated with hairs, but the genital armor is well-developed. 



Imago, male. The antennae of the male are about as long as the 

 thorax, arising from a knob-like basal joint ; the joints are of even 

 length, and from each one arises long delicate hairs, which in our 

 specimens were somewhat appressed to the antennae. But we 

 think it was due to the immaturity of the specimens, and that the 

 hairs stand out as usual in the genus. The lingua is short ; palpi 

 well-developed, incurved; eyes large globose, prominent, black. 

 The body is throughout pale testaceous; on the anterior half of 

 the thorax is an oblong light brown spot and an irregular oval 

 spot on each side of the posterior half of the thorax, extending 

 to a point opposite the insertion of the wing. On the under side 

 of the mesothorax is a broad, flattened, corneous area, the fore 

 legs being widely separated from the two posterior pairs. The 

 sides of the thorax are pale with a few dusky spots. The legs 

 are long and very slender, the middle and hind tibiae and 

 tarsi dusky. The wings are white, reaching when folded to the 

 end of the third segment from, the end of the body. The abdomen 

 is dusky brown, paler at the tip, with a dusky spot on each side 

 of the last two segments; on the under side is a faint greenish 

 tinge. The tip is flattened, the anal forceps are large with the tip 

 bent in, forming a V, and meeting on the median line of the body. 

 Compared with what is evidently a true C-h iron-emus from 

 Labrador, and other species living in Massachusetts, the thorax 

 of the present species is longer and less globular, the meso- 

 sternum presents a longer area, and the antennae are longer and 

 slenderer. The wings are unspotted; there is no transverse costal 

 veinlet at the base of the wing ; the costal vein terminates beyond 



