284 NEW YORK STATE MUSEUM 



of wing; legs only pubescent, first joint of front tarsi about half 

 as long as the tibiae, fourth tarsal joint rather slender and almost 

 as long as the fifth ; length 1.5 mm. Las Vegas Hot Springs, New 

 Mexico. (Goquillett, loc. cit.) 



Genus 42. Tanytarsus Van der Wulp 

 Tijdschr. v. Entomol. XVI (LXX) and XVII, 134 



Larva. Small species resembling Chirouomus, occasion- 

 ally red in color, though more often yellowish. Distinguished 

 from allied genera by their long antennae with elongated apical 

 joints, and the frontal protuberances upon Avhich the antennae 

 are mounted. The epipharynx and its appendages resembles that 

 of Chironomus (pl.25, fig.16, and pl.26, fig.l4) ; the maxilla 

 has upon its inner angle one or more spine-like blades which pro- 

 ject mesad and cephalad (pl.26, fig.l2 mx) ; the thoracic segments 

 frequently have a few short setae. The ventral surface of the 

 eleventh abdominal segment aipparently lacks blood gills. 



Pupa. The thorax has a pair of respiratory organs, each of 

 which consists of a central shaft with lateral filaments (pl.26, 

 fig.3). The dorsal surface of the abdominal segments is charac- 

 teristically marked with hairs and setae (pl.25, figs. 18 and 20, and 

 pl.26, fig.ll) . The eighth segment has a comb at the caudal end of 

 each lateral fin, and the anal segment has a fringe of hairs form- 

 ing a paddle (pl.26, figs. 6 and 15). 



Imago. (P1.30, figs. 14 to 21) Antennae of male 14-jointed, 

 long plumose; antennae of female 7-jointed, sparsely haired, first 

 joint in both sexes large and disk-like. Palpi bent, 4-jointed, the 

 last joint usually a little longer than the preceding. The eyes reni- 

 form, ocelli wanting. Thorax highly arched, projecting somewhat 

 over the head; metanotum arched. Abdomen of the male slender, 

 the anal segment distinctly separated from the preceding; genitalia 

 long and slender; abdomen of the female shorter and stouter. 

 Legs slender, fore tarsi elongated, the fore metatarsus longer than 

 its tibia; hind legs usually hairy. Wings distinctly hairy; anal 

 angle small; crossvein upon. or even proximad of the mid length 

 of the wing; R^^.^ joins the margin at the extremity of the costa; 

 media simple; the forking of tlie cubitus is under or just distad of 

 the crossvein; the lower branch is straight or gently bent down- 

 wards. Species rather small. 



