120 Journal New York Entomological Society, ["^"o'- ^^^^> 



Dr. R. W. Marchand. The tent-trap observations made at Ithaca, 

 N. Y., in 1915 by Miss Ruby B. Hughes indicate that the larv?e of 

 LimnophUa allcni live in wet organic mud. 



I. Larger (wing, $, 21.5 mm.) ; thoracic dorsum reddish brown with three 

 velvety brown stripes, the middle one narrowly split by a line of the 

 ground-color ; wings yellowish and brown ; basal abdominal tergites yel- 

 low without prominent setigerous punctures L. alleni Johnson. 



Smaller (wing, 5- ^o mm.); thoracic dorsum gray with three , narrow 

 velvety-brown stripes, the middle one split by a broad pale line ; ground- 

 color of the wings hyaline; basal abdominal tergites gray with prominent 

 setigerous punctures L. marchandi, n. sp. 



Limnophila mundoides new species. 



Black, the thoracic dorsum shiny ; wings hyaline or nearly so ; femora 

 yellow, the anterior pair with the apical half black; hypopygium of the male 

 enlarged, complex in structure. 



Male. — Length, 5.6 mm. ; wing, 6.2 mm. 



aiostrum black, very short, palpi brownish black. Antennae black, short, 

 .ne first segment elongated, the flagellar segments elongate-oval. Head black. 



Thorax shiny black. Halteres white. Legs slender, the coxse dull yel- 

 low, the base of the fore coxa suffused with black on the outer face ; tro- 

 chanters dull yellow ; femora not conspicuously hairy, fore femora with the 

 basal half yellow, the apical half dark brown ; middle femora with the basal 

 two thirds yellow, the apical third dark brown; hind femora yellow, the tip 

 narrowly browned ; tibiae brown ; tarsi dark brownish black. Wings hyaline 

 or nearly so, the stigma indistinct, the veins dark brown. Venation as in 

 plate I, fig. 3 : Sc short, ending just before the tip of the sector; Sc^ close to 

 the tip of 5"Ci ; Rs long ; ^^+3 very short, subequal to the basal deflection of 

 Rm ; -^1+2 beyond m about equal to cell M^ ; basal deflection of Cmj almost 

 underneath the middle of cell ist M^. 



Abdomen black, the sternites somewhat paler. Male genitalia remarkably 

 developed for this genus of flies, this condition approached by no Nearctic 

 species hitherto described but suggesting in some respects the condition ob- 

 taining in Phyllolabis O. S. and Oromyia Alex. The ninth tergite arched, 

 convex, produced caudally into a prominent median lobe which is slightly 

 enlarged apically and truncated to slightly concave across the tip ; sides of the 

 tergite with numerous very long, prominent hairs ; the ninth sternite is not 

 distinct from the tergite, produced caudad on the mid-line beneath into a 

 prominent bifid lobe which bears an abundance of very short pubescence and 

 a few long hairs ; ninth pleurite complete ; pleural appendages two. a caudal- 

 lying, very slender, slightly curved chitinized lobe that is directed caudad, the 

 tip inward ; the anterior lobe is densely hairy on the outer face, the apex 

 chitinized. Just dorsad of the bifid sternal appendage, on either side, arises 

 a prominent flattened lobe with exceedingly abundant long black hair and 

 numerous punctulations ; the ventral apical angle of this lobe is pale and 

 produced into a short hook directed inward. 



