MAY FLIES AND MIDGES OP NEW YORK 



239 



the anal segment cordate, a third shorter than the one imme- 

 diately preceding ; forceps brownish j^ellow, slender and pointed ; 

 the hairs on the sides yellowish ; abdomen of the female dark gray, 

 with whitish incisures. Legs yellow with brownish articulations; 

 the last two tarsal joints darkened; tarsal proportions as in 

 p 1 n m s 11 s ; male fore tarsi hairy. Halteres yellow. Wings 

 with a slightly yellow tinge, whitish in reflected light; the cross 

 vein dark brown. Lengtii 9 to 12 mm. Washington State. 



60. Chironomus decorus n. sp. 



(PI.23, figs. 7 to 13; pl.29, fig.l2) 



Larva. The larvae were found everywhere in the ponds and 

 ditches around Ithaca N. Y. They are blood red, and about 

 12 mm. long. The head is dark blackish brown; the antennae 

 are short, normal. The dorsal sclerite is narrow ovate, posterior 

 end pointed, truncate anteriorly, with three setae along each 

 lateral margin, the first at the extreme anterior end, the last one 

 half way between the anterior and the posterior end, the second 

 midway between these. Articulated to the cephalic margin, and 

 overhanging the mouth opening is the labrum. There are two 

 pairs of prominent setae upon its dorsal surface; numerous 

 papillae, two or which are quite prominent on the anterior 

 margin and upon the anterior ventral surface. The arrange- 

 ment of the setae and the armature of the epipharynx shown 

 in fig.lO. The epipharyngeal comb (c) has relatively long and 

 uniform teeth; the lateral arms are dark bi-own in color. 

 Each eye consists of two distinctly separated pigment spots. 

 The mandibles (fig.7) are black-tipped, with a fringe of apical 

 setae, a prominent lateral spine, and a group of mesad pro- 

 jecting branched setae; the hypopharjmx has its usual papillae 

 upon the fore margin ; the maxillae are prominent, each with two 

 lateral setae, tlie palpus is short and thick. The labium has a 

 black margin with an outline as shown in flg.8. In many speci- 

 mens the teeth appear to be slightly longer in proportion than 

 shown in this figure.' The anterior prolegs have very numerous 

 curved setae. The body is nearly devoid of even minute setae. 

 The anal prolegs are normal, claws dark, bilobed. Anal setae as 

 usual. The eleventh body segment has four long white blood gills 

 on the ventral surface, and caudad of the dorsal setae of the 

 twelfth segment are four short ones. 



The larva (1) mentioned by Garman (1888) is probably this 

 species. 



Pupa. Dusky greenish brown, the colors of the imago showing 

 through the integument. Length 7 to 8 mm. Tracheal filaments 

 prominent, white and much branched. Thorax with a few scat- 



