272 NEW YORK STATE MUSEUM 



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

 pL30, 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. 



(P1.30, 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 

 vellow, sometimes somewhat infuscated. Fore metatarsus about 

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

 what infuscated. Wings hyaline, anterior veins yellow, posterior 

 one colorless; cubitus forks distad of the crossvein; crossvein at 

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

 f to 1 mm. Several specimens, Ithaca N. Y. Two mutilated speci- 

 mens from South Dakota may also belong here, 



7. Orthocladius sordidelhis Zetterstedt 



1838 C h i r o u o m u s Zett. Ins. Dappon. p.814, 26 

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

 18(>± Chironomus Scbiner. 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 Ost. 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. (PI.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 (tig.l3) sliort, 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 nuir- 

 ginal pa])ilhip and npical setae (fig.l2) ; epipharynx with the usual 

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

 modified. Mandibles stout, ai)ical one half, sometimes wholly, 

 black or dark brown, with a long, slender, lateral seta (fig.l4 md). 

 The maxilla ifig.l4 mx) has a short palpus, some i>ai)illae, and a 

 niesad-iu-ojecting tuft of pointed filaments; upon its ventral sur- 

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

 nuirgin of the ventral head sclorite below the base of the maxilla. 

 The hyi>opharynx has three tufts of papillae upon its margin, one 



