August. 1944 



Ross: Caddis Flies of Illinois 



275 



this incision, somewhat fusiform and almost 

 entirely membranous, with a slight constric- 

 tion near base, the apex tapering to a sharp 

 barbed point. Claspers short and wide, di- 

 vided by an almost circular apical incision 

 into two lobes; the dorsal lobe has a trun- 

 cate apex, swollen dorsal margin, and a 

 thick cluster of long, dark spines on its 

 mesal face at apex ; the ventral lobe has 

 an oblique apex and a larger cluster of long, 

 dark spines on its mesal face at apex. Aede- 

 agus simple and filiform, typical for the 

 genus. 



Female. — In size, color and general 

 structure similar to male. Eighth sternite, 

 hg. 922, set off distinctly from structures of 

 the ninth, the apex wide and divided by a 

 small U-shaped mesal incision into a pair 

 of fairly large lobes which are clothed with 

 long, scattered setae similar to those on the 

 rest of the segment. Bursa copulatrix very 

 long and shaped like a tuning fork, typical 

 for the genus. 



Holotype, male. — Cloudy Creek near 

 Cloudy, Oklahoma: May 4, 1940, Mrs. 

 Roy Weddle. 



Allotype, female. — Same data as for 

 holotype. 



Paratypes. — Same data as for holotype, 

 U, 19. 



Ochrotrichia capitana new species 



This is one of the more primitive mem- 

 bers of the genus, most closely related to 

 xi'iia. It may be separated from this, how- 

 ever, by the definitely marked sclerotized 

 bands of the tenth tergite and the much 

 different arrangement of the black spines 

 on the inner face of the claspers. 



Male. — Length 2.5 mm. General color 

 and structure typical for genus. Genitalia 

 as in fig. 923. Ninth segment annular, with 

 a triangular apical incision on the dorsum 

 for the reception of the tenth tergite. Tenth 

 tergite long and narrow, the dorsal portion 

 mostly semisclerotized with some definite, 

 heavily sclerotized bands running along the 

 dorsum; these converge at the apex and 

 terminate in an upturned, spinelike process. 

 Claspers more or less boot shaped and sim- 

 ilar in shape; the outer face is covered with 

 scattered setae and the mesal face with a 

 dense brush of dark spines near the middle 

 and a linear area of long, stout spines from 

 above that point to the apex; seen from ven- 

 tral view, the claspers appear to taper even- 



ly from base to the bladelike apex, the mesal 

 face concave. Aedeagus typical for genus. 



Female. — Similar in size and general 

 structure to male. Genitalia simple, fig. 

 923, the eighth tergite forming a single 



Fig. 923 — Ochrotrichia capitana, genitalia. 



Male: A, lateral aspect; fl, tenth tergite; C, 



ventral aspect. Female: /), ventral aspect; 

 £, bursa copulatrix. 



rounded sclerite clothed with a scattering of 

 long setae. Bursa copulatrix with the arms 

 of the fork slightly shorter than in other 

 species. 



Holotype, male. — McKittrick Creek, 

 McKittrick Canyon (near Frijole) Texas: 

 April 26, 1939. J. A. & H. H. Ross. 



Allotype, female. — Same data as for 

 holotype. 



Ochrotrichia felipe new species 



The closest ally of this species is tenanga 

 Mosely, fig. 925, from southern Mexico. 

 The two may be distinguished by the differ- 



