272 NEW YORK STATE MUSEUM 



ones yellow, the posterior ones hyaline. Venation as shown in 

 pl.30, fig.6. Halteres cream white; peduncle slightly darker. 

 One specimen bred from larva taken from pond water July 2, 

 Ithaca N.Y. 



6. Orthocladius sordens n. sp. 



(Pl.30, fig.5) 



Female. Yellow ; face, proboscis, palpi and antennae yellowish, 

 the palpi and the antennae, except the basal joints, somewhat in- 

 fuscated. Vertex brownish yellow. Thorax yellow with its three 

 dorsal stripes, metathorax and the sternum reddish. Abdomen 

 yellow, sometimes somewhat infuscated. Fore metatarsus about 

 one third shorter than its tibia; legs yellow, tibiae and tarsi some- 

 what infuscated. Wings hyaline, anterior veins yellow, posterior 

 one colorless; cubitus forks distad of the crossvein; cross-vein at 

 basal third of wing; venation as figured. Halteres yellow. Length 

 | to 1 mm. Several specimens, Jthaca N. Y. Two mutilated speci- 

 mens from South Dakota may also belong here. 



7. Orthocladius sordidellus Zetterstedt 



1838 Chironomus Zett. Ins. Lappon. p.814, 26 

 1850 Chironomus Zett. Dipt. Scand. 9:3521,38 

 1864 Chironomus Schiner. Fauna Austr. 2 : 609 

 1874 Orthocladius V. d. Wulp. Tijd. v. Ent. 17 : 133 



1877 Orthocladius V. d. Wulp. Dipt. Neerl. p.280, 6 



1839 Chironomus variabilis Staeger. Krojer : Naturh. Tids. 



2:571, 44 

 1850 Chironomus Zett. Dipt. Scand. 9 : 3519, 36 



1878 Chironomus O&t. Sack. Cat'l. Dipt, p.21 



1898 Chironomus Lundb. Vidensk. Meddel. p.280, 63 



1839 Chironomus varians Staeger. Krojer's Tids. 2 : 573, 47 



1850 Chironomus Zett. Dipt. Scand. 9 : 3546, 71 



Larva. (P1.25, figs. 12 to 15.) Yellowish green; head short, 

 brown, with a number of delicate dorsal setae. Each eye consists 

 of two nearly contiguous spots. Antennae (fig.13) short, about 

 three fifths the length of the mandibles, brown in color with apex 

 of each joint paler. Labrum blunt at apex, with a few short mar- 

 ginal papillae and apical setae (fig.12) ; epipharynx with the usual 

 lateral arms, but the curved setae are very much reduced and 

 modified. Mandibles stout, apical one half, sometimes wholly, 

 black or dark brown, with a long, slender, lateral seta (fig.14 md). 

 The maxilla (fig.!4mx) has a short palpus, some papillae, and a 

 mesad-projecting tuft of pointed filaments; upon its ventral sur- 

 face a pair of setae, and another larger pair upon the anterior 

 margin of the ventral head sclerite below the base of the maxilla. 

 The hypopharynx has three tufts of papillae upon its margin, one 



