NATURAL SCIENCES OF PHILADELPHIA. 245 



cubital a little longer ; petiolate areolet shorter than its petiole. 9 differs 

 from the tf by the brownish-ferruginous tinge of its body. The antennae are 

 not longer than the head and the thorax together ; they have no spines but 

 only sparse hairs ; ten indistinct joints can be counted ; ovipositor ferru- 

 ginous. 



I possess two specimens of the ^ : one caught by me near Trenton 

 Falls, N. Y., the other by Mr. Scudder in Mass. My only female specimen I 

 also brought from Trenton Falls, and do not doubt of its specific identity 

 with the males. 



A. longicornis. Cinerea, aim absque areola petiolata ; stigmate subquad- 

 rato, fusco ; thorace vittis tribus obscuris ; long. lin. 4-5. 



? Anisomera longicornis Walker, List of Diptera of the Brit. Mus. i. p. 82.. 



Head cinereous, palpi black, antennae black ; two basal joints pale ; those 

 of the rf are three or four times longer than the body ; the third joint reaches 

 beyond the base of the wing ; every following joint is longer than the prece- 

 ding ; the sixth joint as long as the fourth and fifth together ; the spines 

 on the lower surface of the antennae become short and indistinct towards its 

 end ; besides the spines there is a microscopic pubescence on the same side of 

 the antennae ; antennae of the 9 hardly reaching beyond the origin of the 

 wing ; no spines, but hairs ; two basal joints and base of the third yellowish ; 

 third joint as long as the two first, taken together ; the fourth more than 

 twice shorter than the third ; the fifth a little longer than the fourth ; the 

 following three joints are of about the same length ; the ninth is a little longer 

 and the tenth a little shorter than the preceding ones. Thorax cinereous ; a 

 long straight pubescence on the sides in the ^ ; no such pubescence in the 

 9 ; three blackish stripes on the praescutum ; intermediate stripe cuneiform, 

 with a distinct brown line in the middle ; the lateral ones abbreviated before 

 and extended over the scutum behind ; the lower portion of the pleurae hoary ; 

 scutellum and metathorax grey ; halteres pale ; feet black ; coxae cinereous, 

 trochanters and femora tawny, except the tip of the latter, which is brown. 

 Abdomen greyish black ; genitals of the same color ; ovipositor of the 9 Very 

 short, (not longer than the segments of the abdomen). Wings whitish- 

 cinereous, with brown veins ; no petiolate areolet ; subapical area longer than 

 the second radial ; cubital a little longer than both ; stigma situated between 

 the mediastinal and stigmatical cross-veins, and not much longer than 

 broad. 



Mr. Walker's description agrees quite well with my specimens, only he 

 does not mention the spines on the antennae, nor the presence of the discal 

 areolet.; the latter characters especially he ought to have mentioned, as the 

 genus Anisomera, in which he locates this species, has no discal areolet in 

 its typical form. The correctness of my identification is not therefore quite 

 certain. 



I have two $ specimens ; from Maine, (Mr. Packard) ; from Trenton Falls 

 (nob.), and one 9 from Illinois, (Mr. Kennicott.) 



Amalopis Halid. 



Front ivith a tubercle behind the antenna. Palpi nearly as long, or longer, than the 

 head ; last joint much longer than the preceding. Eges hairy. Mediastinal cross-vein 

 far removed fom the tip of the mediastinal vein, and anterior to the origin of the pe- 

 tiole. Discal areolet (when extant) pentagonal, the second lower discal cross- vein being 

 very oblique: Wings divaricate in repose. The tf genitals are totally different 

 in their structure, both from Limnobia and Limnophila, and seem to 

 approach those of T i p u 1 a ; the forceps consist of a coriaceous substance, with 

 a heltnet-shnped lobe and several horny branches on the inside, (fig. 32, forceps 

 of A. inconstans.) On account of this hard substance, these organs pre- 

 serve pretty well in dry specimens. 



1859.] 



