J. K. MALLOCH 147 



Lispoidcs aequifrons Stein 



18U7. Liiiinu/ilinrd (uyuifrons Stein, Berl. Ent. Zeitschr., xlii, p. 205. 



One male; Swarthniore, Pennsylvania, Jime '.^, 100"). 



I have seen this species also from lUinois, New Jersey, and CaH- 

 fornia. 



Limnophora groenlandica ^p. n. 



Female. — Black, covered with dense grayish ])ruiMescence. Frontal tri- 

 angle brown, opaqvie; interi'rontalia brownish black, opaque; orbits, face, 

 and cheeks white pniinose. Dorsum of thorax with a brown suffusion on 

 greater portion of disc, without clearly defined vittae. Abdomen shining, 

 segments one, two and three each with a large poorly defined subtriangular 

 brown spot on each side on dorsum. Calyptrae white. Halteres yellow. 



Structurally similar to discreta Stein, differing as follows: Frontal triangle 

 shorter and broader; arista shorter, the basal swelling more elongate, and 

 the pubescence much shorter; parafacial in profile broader, at least as wide 

 as third antennal joint; cheeks with more numerous short hairs; mid tibia 

 with an antero-dorsal bristle; hind tibia with a weak antero-dorsal bristle 

 apicad of the strong one. Length, 4 mm. 



Type.— 9; West Coast of Greenhmd, 1891, (Mengel and 

 Hiifihes, on the Peary Expedition), [A. N. S. P., Type no. Cy2M]. 



Limnophora velutina n. n. 



I'Jl.'j. I'drlinninphoni f)nuiiici.^<ju(n/i(i Malloch [nee Strobl], Proc. T'. S. Xal. 

 Mus., xlv, p. 605. 



This species was originally jilacetl in a genus which I considered 

 distinct from Limnophora, and which is distinct from my present 

 concept of that genus, Ijut there is another species which does 

 not Ijelong to the genus Limnophora in the restricted sense, which 

 has the same specific name, and it thus appears necessary to 

 change the name of the American one as above. 



The species occurs in the nortlieastern states and in New- 

 f()un<lland. 



The apex of the hind tiliia and hypopygial forcejis and fifth 

 sternite are represented in figures 12, 21 and 22. 



Limnophora acuticornis sp. n. 



Male. — Black, faintly shining, coveretl with dense gray pruinescence. 

 Head entirely black, frons, face and cheeks with dense silvery pruinescence. 

 Thorax with a distinct narrow central vitta and a broader less distinct one 

 on each side of it. Abdomen with a narrow fuscous or dark brown dorso- 

 central interrupted vitta, basal segment (second) indistinctly brownish on 

 dorsum, the next two segments each with a large subtriangular brownish- 



TK.VX.S. .VM. ENT. SOC, XLVI. 



