306 NEW YORK STATE MUSEUM 



The following is Meigen's description of M . p i c i p e s : 



Wholly velvet black, including antennae and halteres; only the 

 legs are pitchy, and the wings are grayish, hairy. Length 2 to 

 2.5 mm. (Greenland, Staeger.) 



11. Metriociiemus knabi Coquillett 



1904 Metriocnemus Coq. Canadian Entomologist, p.ll 



Larva. Pale yellow ; head dark yellow ; eyes, apical half of the 

 mandibles, margin of the labium, dark brown. Claws of both fore 

 and hind prolegs yellow; the dorso-caudal papillae yellow, with 

 about six black setae. Head short, about 1.5 times as long as 

 wide; antennae short like Chironomus; eye spots small, each 

 composed of two confluent pigment spots, tlie anterior one 



Fitf. 16 Ventral aspect of Fig-. 17 Dorsal aspect of 



larval mouth parts of Me- caudal end of pupa of Me- 



triocnemus knabi xl80 triocnemus knabi xl80 



smaller. Mouth parts resembling those of Orthocladius, the 

 mesad projecting processes of the maxillae spine-like, the palpi 

 small; the labrum, epipharynx, lateral arms and hypopharynx 

 as in the above-mentioned genus. Labium with the first and 

 second pairs of lateral teeth smaller than the third, fourth and 

 fifth pairs. Anterior prolegs with simple setae (i. e. not pecti- 

 nate), at the base punctate with groups of minute and very short 

 spines. The claws of the posterior prolegs of two sizes, the 

 laterals slender, the peripherals shorter, stouter and broadened 

 at base. There are four anal blood gills on the 12th segment 

 but the ventrals of the 11th segment appear to be wanting. The 

 dorso-caudal papillae are more than three times their diameter 

 in length, in this respect resembling Tanypus, At the apex of 

 each papilla there are about six long black setae. 



Pupa. It resembles an Orthocladius pupa, but the breathing 

 trumpets are apparently wanting. The dorsal posterior margin 

 of each abdominal segment minutelv scalloped. Near the anterior 



