from, the Philippine Islands. 89 



Libnotes familiaris n. sp. g. Ochraceous, thorax with a 

 brown stripe; wings hyaline, with a small stigmatic pale brown 

 spot. — Length about 7 mm. 



Resembles the european L. modesta in its coloring. Head, rostrun\, 

 palpi and antennae black (at least apparently so ; the head is somewhat 

 injured). Thorax ochraceous-yellow, shining, with a brown stripe in the 

 middle of the dorsum. Halteres brownish. Abdomen and genitals 

 brownish. Legs yellowish brown. Wings altogether hyaline, with 

 brown veins; a small, rounded brownish stigmatic spot at the end of 

 the first vein; the latter is incurved towards the costa and has the 

 crossvein very close by its tip; bases of the 2°^ and S"^** post. c. almost 

 on the same line , the 2°** being a little more drawn inwards. — A 

 single male. 



Mongoma tenera n. sp. $. Head dark brown, antennae 

 and palpi brown, rostrum, yellowish; thorax reddish-brown above, 

 more yellowish below; abdomen, including the genitals, brown, 

 the venter yellowish. Wings tinged with grayish; halteres broivn. 

 Femora pale brownish; the tip, as well as the remainder of the 

 leg, whitish. — Length 8 — 9 mm. — A single male. 



NB. I have no doubt that this species in congeneric with Mon- 

 goma fragillima Westwood, Trans. Ent. Soc Lond. 1881, 364, Tab. 

 XVII, f. 1 (from Mongoma Lobah, tropical Africa). Not only that 

 the generic characters are the same, but even the coloring of the spe- 

 cies has many points in common, as for instance, the prevailing of the 

 white color on the legs. There is a slight diflFerence in the venation, 

 the bases of the second and third posterior cells being in a line in 

 M. tenera, while in M. fragillima the base of third p. c. is more 

 drawn out in the proximal direction; the posterior crossvein in the 

 former is a little before the discal cell, while in the latter it coincides 

 with its proximal end. 



The other generic characters of the species before me may be 

 defined as follows: 



General habit of a Dicranomyia, that is, its slenderness and 

 delicate structure. Head small, rostrum short, palpi short, their last 

 joint very short; eyes glabrous, separated by a narrow front; antennae 

 16-jointed; bent backwards, they would reach a little beyond the root 

 of the wings; joints of the flagellum oblong, of nearly equal length, 

 except the first, which is a little longer; short-verticillate ; prothorax 

 well developed, prolonged in a short neck; mesonotum gibbous; abdomen 

 elongated, slender, forceps of the male small, slightly incrassate; legs 

 exceedingly long (the femora alone are about IV2 the length of the 



