206 NEW YORK STATE MUSEUM 



Schiner. Fauna Austr. 2:598 

 V. d. Wulp. Dipt. Neerl. 269, 40 

 Johnson. Proc. Acad. Nat. Sc. Phil. 320 

 obscurus Zett. Ins. Lappon. 815, 31 

 pilicornis Meigen. (nee. Fabr.). Syst Beschr. 



r u d i s Zett. Ins. Lappon. 809, 3 



Larva and pupa. Miall and Hammond (1900) state that the 

 larva inhabits a tube and tliat it possesses red blood. There are 

 no ventral blood gills. The pupa has a tail fin composed of thirty 

 or forty long setae, and the abdominal segments are laterally ex- 

 panded. On the second abdominal segment are paired postero- 

 lateral transparent appendages of small size, enclosing blood 

 spaces. There are t^v^o conical prominences, each bearing a long 

 seta, on the vertex of the head. The tracheal gill divides into 

 three primary branches as usual. The secondary branches are 

 comparatively few ; each encloses a number of tracheae which 

 pass to the ultimate branches. 



Imago, male. Black; dorsum of the thorax dark gray, with 

 three black longitudinal stripes, scutellum sometimes brown; ab- 

 domen black, at the incisures a little more gTay, the last few 

 segments somewhat wider and flattened (as with the males gen- 

 erally), hairs dark, the forceps short and black, the arms slender. 

 Head, antennae and palpi black. Legs black, the tibiae and the 

 tarsi often brownish, the fore tarsi of the male densely bearded 

 with brown hairs; the metatarsus a little longer than the tibia. 

 Wings whitish, the anterior veins more distinct, the crossvein 

 black. Halteres dark. The female does not have the bearded fore 

 tarsi and her halteres are often sordidly white. Length 6 to 7 

 mm. Schiner, loc. cit. 



Florida (Johnson). Some specimens from South Dakota which 

 T identify as this species have both anterior and posterior margin 

 of each abdominal segment grayish, the posterior most distinct; 

 the fore tarsi of the male long but rather sparsely haired, and the 

 fore metatarsus about one eiglith longer than its tibia ; the second, 

 third, fourth and fifth fore tarsal joints gradually decreasing in 

 length. 



14. CMronomiis hyperborens Staeger 



1845 Chironomus Staeger. Krojer : Naturh. Tidsslir. n. s. 1 :349 



1878 Chironomus Osten Saclien. Cat'l. N. A. Dipt 20 



1898 Chironomus Lundbeck. Videnskab. Meddel. 272, 49 



1865 Chironomus polaris Bohem. Ofv. K. Vet. Akad. Forh. 

 574, 18 



Blackish, thorax grayish, with three black stripes, abdomen 

 black, with narrow whitish fasciae, wings white with a black spot. 

 Length 7 to 8 mm. 



