ART. 25. NEW SPECIES OF COSTA EICAN FLIES— ALEXANDER. 5 



much larger than the pleurite, the beak-like prolongation of the 

 proximal face with two very long, slender spines that are practically 

 as long as the prolongation itself. 



Habitat.— Costsi Rica. 



Holotype.-M^le, San Jose, November 12, 1920 (A. Alfaro). 



Type.— C&t. No. 24696, U.S.N.M. 



LIMNOPHILA DICTYOPTERA, new species. 



General coloration dark brown; legs light yellow, the terminal 

 tarsal segments darkened; wings creamy- white with a conspicuous 

 reticulate brown pattern, larger blotches at the origin of Rs, at the 

 stigma and near the outer end of cell R^- 

 Female.— 'Length 9 mm. ; wing 8.7 mm. 

 Rostrum and palpi dark brown. Antennae short, dark brown. Head 

 brown, provided with numerous black bristles set in conspicuous dark 

 setigerous punctures. 



Mesonotum dark brown, very sparsely brown polmose, the prae- 

 scutum with an indistinct capillary brown stripe. Pleura dark 

 brown. Halteres brown. Legs with the coxae dark brown ; troch- 

 anters yellowish brown; remainder of the legs light yellow, only 

 the terminal tarsal segments dark brown. Wings creamy-white 

 with a conspicuous dark brown reticulate pattern m all the ceils, 

 in cell Sc very reduced; larger brown blotches at the origin of Bs; 

 a large oblioue area extending from the stigma to the fork of M; 

 another large area in the outer end of cell R, and the extreme tip 

 of 2nd R,; numerous crossbars and other markings m the cells give 

 to the wings a closely reticulated appearance; wing-tip in cells R„ 

 R. and M^ broadly cream-color; anal angle of the wing in cell 2nd A 

 darkened; these dark crossbars include a series of about twenty -five 

 in the costal cell; veins light brown, more yellowish in the pale 

 areas. Venation: Sc, ending just beyond the fork of R^^^, Sc, at 

 the tip of Sc^, and about twice the length of the latter; Rs long, 

 strongly arcuated at origin; R,^, shorter than the basal deflection 

 of Cu,; r some distance from the tip of R,, the latter alone longer 

 than the basal deflection of Cu^; inner ends of cells R, and 1st M^ 

 about in alignment; cell M^ about as long as its petiole; cell IstM^ 

 elongate-rectangular ; m about one-half the outer deflection of M^; 

 basal deflection of Cu^ midlength of cell 1st M^. 



Abdomen dark brown, the posterior margins of the sternites nar- 

 rowly paler. Ovipositor with the valves long and slender, reddish 

 horn-color. 



Habitat. — Costa Rica. 



' Holotype.— Female, San Jose, October 6, 1920 (A. Alfaro). 

 Type.— Cat. No. 24697, U.S.N.M. 



Limnophila dictyoptera is allied to L. guttulatksima Alexander, 

 likewise from Costa Rica. 



