98 NEW YORK STATK Ml'SKl'M 





mandibles are I In- most conspicuous, .slender at the tip and 

 simple, but enlarged basally (pi. IS. fig.l). The labnini is rounded 

 ami provided with one or two pairs of papillae, which may be 

 larger than the antennae aiu,l of similar construction (pl.18, 

 lig.lhi. The maxillae ( tig. -in. / i are lleshy. lobed. and each pro- 

 vidi-d \\itli a large | wo -jointed palpus ip). The hibium is quite 

 small and inconspicuous, and dilVers from the corresponding part 

 in Chironomus in having a soft and rounded edge, but 

 upon its inner surface forming tin- iloor of the mouth cavity it 

 is heavily chitini/.ed und formed into one or more cephalad pro- 

 jerting teeth ipl.is. lig.L'/i. The thorax ami abdomen are wholly 

 without prolegs; usually with but few or no setae excepting at 

 the caudal end where iliere .-ire about eight long setae and a few 

 short ones. Projeeiing from the rectum, when not retracted, 

 may be seen llie delicate while hi 1 gills. 



The pupa is brownish, somewhat tapering, with an ovate 

 thorax. It floats nearly motionless at the surface of the water, 

 or is attached to plants a little above the surface but still 

 within the water film. The respiratory trumpets are slender, 

 and more or less cylindrical with the aperture slightly enlarged 

 ( pl.1S. ligs.it and Id/ i. The abdominal segments are provided with 

 spines, setae and tubercles. The anal fin ends in two pointed 

 lobes I pi. IS. 1iir.ll i. IM-of.-^or Mik. on !>ag" 1^:: in Vol. 7 of the 

 Wiener Ent. Zeit., described a species of Ceratopogon 

 with hairy wings, but having a footless larva. This form occu- 

 pies a place between the above two groups; and its habitat, the 

 very moist or wet. ulcerous parts of the stems of Aesculus 

 hippocastanum, also suggests an intermediate form. 

 This species differs from all known members of both groups in 

 possessing instead of either setae or prolegs a retractile disk, 

 on the periphery of which are arranged five pairs of curved 

 spines. It agrees with the second group in having no prolegs, 

 and with the first in having a mandible with a three-toothed 

 margin. 



The pupa has cylindrical, elongate respiratory trumpets; the 

 abdomen is provided with spiny tubercles, and the caudal end 

 has a crown of tubercles 1 . The adult would be classified with Kief- 

 fer's 2'enus C u 1 i c o i d e s . 



