602 PROCEEDINGS OF TBE yATIOyAL MVSEVM. vol. n. 



Habitat. — Holotype. — Female, Culebra, Panama. 

 Type. — InU. S. National Museum collection (No. 14921). 

 Related to M. manca WUliston, but much smaller and coloratiomxl 

 and venational details different. 



MONGOMA LONGIFUSA, new species. 



Brown; stigmal sjjot distinct; R2+3 longer than Rj alone. 



Length 4.4 mm; wing 4.2 mm. 



Female. — Head: antennae and palpi brown; front, vertex, occiput 

 and cervdcal sclerites brown. 



Thorax: Dorsum brownish-yellow; an indistinct, very narrow, 

 brown median line; transverse suture interrupted medially and 

 praescutum produced caudad into two obtuse denticulas; pleurra dull 

 yellow. Haltercs light yellowish-brown. Legs uniform brown. 



Wings: subhyaline; cells C and Sc slightly more yellow, stigmal 

 spot and extreme tip of the wing pale brown; veins light brown. 

 Venation: Scj retracted rather far toward the base of the wing; 

 R2+3 between r and the fork, longer than R2 alone. Basal deflection 

 of Cui before the fork of SL (See fig. 1 0.) 



Abdomen: light brown; lateral line black; the apical segments of 

 the abdomen slender, tubular, valves of the o^•i])ositor very slender, 

 arcuated. 



Habitat. — Holotype. — Female, Igarai)e Assu, Para, Brazil, Jan. 

 19, 1912 (Parish,* coll.). 



Type. — In Cornell University collection. 



Related to M. pallida Williston, but differs as follows: darker in 

 coloration; a distinct, though pale, oval stigma; longer fusion of 

 Rj+3, etc. 



Genus LACHNOCERA Philippi. 



Lachnocera Phii.ippi, Verh. Zixjl.-bot. Ges. Wien, vol. 19, 1865, p. G15.— Osten 

 Sacken, Monographs, vol. 4, 1869, p. 335. 

 The following description is adapted from Osten Sacken: ' 

 Antenna, at least those of the male, ai-e as long as the body, 13 segmented (?); first 

 segment cylindrical, stout, elongated; the second of the same length as the first, 

 gradually attenuated; the following ones slender, stouter in the middle, on both sides 

 with long, hirsute hairs; the last segments are rather indistinct. Rostrum short; 

 fourth segment of the palpi equal to the third in length (?). Wings with two marginal 

 cells; the first large; the second short, separated from the first by an oblique vein; 

 a single submarginal cell; four posterior cells; discal cell pentagonal; basal cells elon- 

 gated, the second longer. Feet slender. 



LACHNOCERA DELICATtJLA PhUlppL' 



The following is translated from Philippi"s original description: 

 First segment of the antennae testaceous; remainder and palpi, 

 grayish-brown; thorax testaceous with brown stripes; coxae and 



> Translation, Monographs, vol. 4, 1S69, p. 335. 



» Verh. Zool-bot. Ges. Wicn, vol. 19, 1S65, pi. 23, flg. 5. 



