456 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 105 



4. Forewing with Sc appearing separate from Rl or to atrophy in pterostigma 



(Japan) (p. 518) Sisyrella Banks 



Forewing with Sc appearing to run into Rl or to be joined by a cross-vein, 

 not atrophying in pterostigma (cosmopolitan) (p. 456). . . Sisyra Burmeister 



Note: The status of three genera is not yet settled. Examination of the 

 genotype of Sisyrella may disclose stronger characters for separating Sisyra 

 and Sisyrella ; however, Sisyrella appears to be a weak genus and perhaps is 

 not distinct from Sisyra (see p. 519). The possibility of the synonymy of 

 Rophalis and Neurorlhus also has not been fully investigated (see p. 521). 



Genus Sisyra Burmeister 



Sisyra Burmeister, 1839, p. 975.— Banks, 1905, p. 25.— Navds, 1935, p. 40.— 

 Killington, 1936, p. 228.— Carpenter, 1940, p. 253. 



Brownish spongilla-flies. 



Genotype: Hemerobius fuscatus Fabricius (by subsequent designa- 

 tion by Banks (1905, p. 25)). 



Head (figs. 7,a-f; 8, a; 9,a,c,e,f): Antennae with approximately 

 35-50 segments, two whorls of setae on all but first or basal segment, on 

 which the setae are irregularly an-anged; face shorter than in Climaciay 

 clypeus and labrum with anterior margins almost straight, labrum 

 approximately 3K times as broad as long, setose, and with anterior 

 projections on both sides of center; postoccipital margin of foramen 

 concave in center with two lateral convexities; median sulcus some- 

 times pronounced; maxillary palpi sometimes with first, second, and 

 fourth segments shorter than the third (which is approximately 1)2-2 

 times as long) and the fifth or terminal segment, which is almost 

 twice as long as the third, broadest at base, narrowed and tapered to a 

 point at apex; labium (fig. 7,b) with postmentum and prementum 

 closely adjoined, at times prementum almost appearing divided 

 into anterior and posterior plates, but differing from Climacia, which 

 shows a distinct membrane between the postmentum and prementum, 

 and another distinct membrane between the anterior and posterior 

 plates of the prementum; labial palpi with thu'd or terminal segment 

 greatly enlarged, flattened, triangle shaped and very wide at base, 

 the second small and subcylindrical, the first approximately 1^-2 

 times the length of the second, and narrowed proximally. 



Thorax (fig. 8,b-d) : Pronotum shorter, smaller, and more furrowed 

 than in Climacia; bases of setae on laterocervicales stouter than in 

 Climacia; median projection of basisternite quadrate; posterior margin 

 of metepimeron with caudal indentation (x, fig. 8,c) less pronounced 

 than in Climacia; mesonotum and metanotum with scutellum having 

 a broader apex than and mesoscutellum with posterior lateral margins 

 of apical shield-shaped depression longer than in Climacia; meta- 

 scutum with halves more irregular and metanotum with center more 

 depressed than in Climacia. 



