January 1S93.] 



PSYCHE. 



371 



at extreme base of wing whicli connects the 

 first and sixth veins, marginal vein not 

 extending beyond tip of wing. Legs slender, 

 not dilated, coxae not elongate; hind tibiae 

 spurred, middle and even front tibiae with 

 microscopic spurs; metatarsi elongate, 

 second joint of hind tarsi also elongate, of 

 middle tarsi somewhat elongate, of front 

 tarsi scarcely so, penultimate tarsal joint of 

 all the feet shortened, the last and ante- 

 penultimate joints about equal ; no pulvilli. 



Tersest kes torrens n. sp. 5 . — General 

 color blackish. Eyes dark brown; antennal 

 excavations cinnamon colored, nearly three 

 times the diameter of first antennal joint; 

 front, face, and lancets shining black, the 

 front with four blackish hairs on vertical 

 margin arising from four papillae; antennae 

 black, clothed with whitish pubescence; 

 palpi blackish, labium brownish with some 

 whitish pubescence terminally; occipital 

 orbits with a few black hairs. Thorax and 

 scutellum deep shining black, smooth, 

 glabrous, except that the thorax has some 

 scattered black hairs anteriorly. Abdomen 

 soft opaque brown, varying to light brown, 

 in some of the specimens flavous or rufous at 

 base; balsam mount showing two oval 

 black spots (bodies?) at base of fifth seg- 

 ment; ovipositor brownish. Legs blackish, 

 tarsi brownish, tibiae slightly so. Wings 

 grayish hyaline, with hardly a smoky flavous 

 tinge, the delicate fringe of hind margin 

 somewhat longest on anal angle where it 

 terminates abruptly ; veins pale, except first 

 and second longitudinal veins which are 

 brown and end in a brown stigma on costal 

 margin (the first vein becomes obsolete ju6t 

 before reaching stigma) ; halteres brownish, 

 knobs whitish. 



Length of body (inch ovipositor), 13-5 

 mm. (empty) to 2 1-5 mm. (abdomen dis- 

 tended with blood) ; of wing, 1 1-5 mm. 

 Fresh and alcoholic specimens are slightly 

 longer. Described from both dried and alco- 

 holic specimens, and balsam mounts. Six 



specimens collected, June 21, on Continental 

 Divide, Socorro county, N. M., 7000 ft. This 

 gnat was not observed at any other place 

 than the one above named. 



Note.— It should be stated that what I have 

 called the first longitudinal vein is the 

 auxiliary vein of other families. I have 

 been in doubt whether to describe the wing 

 as having five, or six, longitudinal veins, 

 since the first two in the balsam mount show 

 only as the sides of a single vein. Since, 

 however, they appear in the dry wing, with a 

 low power, as two distinct veins, I have so 

 considered them, and have made the drawing 

 of the wing to represent this appearance. 



Explanation of Plate 8. 

 Tersest/ies torrens Twns. 5- 



Fig. i. — Head, front view, showing lancets, 

 labium, palpi, antennae, antennal excava- 

 tions, and reniform eyes. 



Fig. 2. — Wing. (It should be stated that the 

 stigma does not show in the balsam mount 

 as represented in the figure, but there is a 

 slighter, more general infuscation in the 

 region of the first two veins.) 



Fig. 3. — Abdomen, dorsal view, showing 

 ovipositor, two oval black bodies of fifth 

 segment, and a large irregular contained 

 body (mostly in second and third segments), 

 probably the alimentary canal distended with 

 blood. 



Fig. 4. — Hind leg, with coxa attached. 



Fig. 5. — Middle leg. 



Fig. 6. — Front leg. 



Figs. 2 to 6 are enlarged on the same scale. 

 Fig. 1 is still more greatly enlarged. The 

 hair lines accompanying figs. 1 to 3 show the 

 natural size. The drawings were all made 

 from balsam mounts, and outlined with the 

 camera lucida. The scanty material in my 

 possession prevents the figuring at the 

 present time of the component pieces which, 

 form the lancets. 



