August, 1944 



Ross: Caddis Flies of Illinois 



283 



Paratypes. — New Mexico. — Fort Win- 

 gate: Aug. 8, 1908, John Woodgate, 1 9 ; 

 Aug. 24, 1 9 ; Sept. 1,19; Sept. 21, 19. 



Mexico. — Cerro Potosi, elevation 8,000 

 feet, Municipio de Galeana: July 8, 1938, 

 H. Hoogstraal, \ S , 19. 



Texas. — Same data as for holotype: 1 S , 

 1 9 . McKittrick Creek, McKittrick Can- 

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

 U, 19. 



Three of the paratypes from Fort Win- 

 gate are deposited with the Academy of 

 Natural Sciences of Philadelphia. 



C hyranda new genus 



Adults. — General structure typical for 

 family. Head without macrochaetae behind 

 ocelli. Maxillary palpi very long in both 



Fig. 942. — Chyranda 

 centralis cT, head. 



male, fig. 942, and female. Mesonotum with 

 warts elongate. Tibial spur count 1-3-4. 

 Apical segment of tarsi without black spines. 

 Wings very similar in general aspect to 

 those of Limnephilus, see fig. 636. 



Genotype. — Asynarchus centralis Banks. 



The very long palpi distinguish this genus 

 from Limnephilus and others to which it is 

 related. In the North American fauna this 

 character will separate it from all genera 

 which do not differ from it in wing vena- 

 tion. 



Oligophlebodes Ulmer 



Additional material secured from various 

 localities in the western mountains indicates 

 that there are at least five species in this 

 interesting genus. To a certain extent color 

 characters have been found of some use in 

 making identifications, but for the most part 

 reliable differences are confined to the geni- 

 talia. 



¥ox the species so far differentiated, char- 

 acters have been found to separate the fe- 

 males to species as indicated in the key. 



KEY TO SPECIES 



1. Eighth and ninth sternites well sep- 



arated, the ninth segment annular 

 and bearing a complicated set of 



parts, fig. 943 (males) 2 



Eighth and ninth sternites merged to- 

 gether, the ninth platelike, fig. 948 

 (females) 6 



2. Claspers twisted so that their apex is 



nearly in a vertical plane and pro- 

 jecting almost directly back, the 

 apex somewhat truncate in lateral 



view, fig. 943 3 



Claspers in a horizontal plane, fig. 946, 

 sometimes sinuate, the end narrow 

 in lateral view, fig. 945 4 



3. Lateral projection of ninth segment 



large, at least equal in area to lateral 

 aspect of claspers; below lateral pro- 

 jection the segment is incised less 

 than half its width to receive clasp- 

 ers; apex of ninth sternite forming 



a wide angle, fig. 943 sierra n. sp. 



Lateral projection of ninth segment 

 much smaller than lateral aspect of 

 claspers; below lateral projection 

 the segment is incised more than 

 half its width to receive claspers; 

 apex of ninth sternite acute, fig. 944 

 minutus Banks 



4. Blade of claspers long, sometimes 



sinuate, narrow at tip; apex of ninth 

 sternite long and sharp, fig. 945. . . . 



ruthae n. sp. 



Blade of claspers short, stocky at tip; 

 apex of ninth sternite shorter and 

 with a much broader apical angle, 

 fig. 946 5 



5. Blade of claspers directed almost 



straight back, robust, and with 

 mesal margin armed with short 

 teeth, fig. 946; body dark brown to 



black ardis Ross 



Blade of claspers angled obliquely 

 mesad, slender, with only the curved 

 tooth forming the apex, fig. 947; 

 body yellow sigma Milne 



6. Lateral lobes of subgenital plate trun- 



cate except for a slight emargina- 

 tion at middle, fig. 948. . . .ruthae n. sp. 

 Lateral lobes of subgenital plate 

 rounded, fig. 949, or oblique, fig. 

 951 7 



7. Lateral lobes of subgenital plate 



rounded and projecting markedly 



beyond mesal lobe, fig. 949 



minutus Banks 



Lateral lobes of subgenital plate not 

 projecting beyond mesal lobe, fig. 

 950 8 



8. Mesal lobe of subgenital plate scarcely 



