AQUATIC INSECTS IN NEW YORK STATE 403- 



well arched, transverse suture wanting; scutellum narrow,, 

 metanotum well developed; abdomen long- and narrow, eight 

 segmented besides the anal segment; genitalia inconspicuous; 

 legs long and slender, with fine short hairs, metatarsus nearly 

 as long as the following four joints taken together; claws 

 slender, each with a single tooth on the under side; wings long 

 and slender, extending almost to the margin of the eighth 

 abdominal segment; the margins, and veins except the true cross - 

 veins and the first anal, covered with flattened hairs. Venation 

 as in the figure; anal angle obtuse, posterior lobe prominent and 

 rounded. Halteres free. 



Pelo^ ;Tipis americana nov. sp. 

 pi .41 

 Female. Antennae when flexed downward reaches just a 

 trifle beyond the outstretched palpi. The upper surface of the- 

 epistome is brown, yellowish on the sides, the labrum pure white. 

 The labium, which is somewhat prolonged beyond the labrum 

 is brown beneath; this color extends to near the lobelike tip. 

 The lobes are hemispherical and pale yellow, covered with black-^ 

 ish or dark brown bristles. Black hairs cover both the upper sur- 

 face of epistome and the under surface of labium, and a few 

 bristles on inner eye margin. The front is pale yellow on the lower- 

 part, and brown on the upper; the vertex is brown; back of head- 

 yellow; palpi brown, the articulations and all of the last two 

 joints yellow, covered with black hairs; antennae reddish brown, 

 the two basal joints and all of third joint except tip, and bases 

 of all the others pale yellow, its hairs black. Thorax yellowish 

 brown; the anterior margin of thorax, a spot on each side of it,, 

 four dorsal stripes, and a spot over the root of each wing reddish 

 brown. The dorsal stripes are wide, the median pair only sepa- 

 rated by a fine line much abbreviated posteriorly; the lateral' 

 stripes abbreviated anteriorly. Scutellum, pleura, and meta- 

 notum yellow, the latter with a triangular spot of brown 

 anteriorly, which is prolonged backward into a fine median line; 

 pectus reddish, or reddish brown; thorax and abdomen nearly- 

 bare; abdomen eight jointed plus anal segment, yellow, each 

 segment with a reddish brown fascia which covers the posterior- 

 third of the segment, excepting its extreme edge. The anterior 

 margin of each fascia produced forward at the middle and the 

 sides till the brown color nearly reaches the anterior margin of 

 the segment. The anal appendage consists of four rounded, in- 

 conspicuous pieces. The venter is paler than the yellow of the 

 dorsum. Legs yellow, a few small spots on the coxae, the tip 

 of all femora, base and tips of all tibiae and the tarsi except the- 



