EiMBTOPTERA OF THE NEW WORLD ROSS 451 



basally but gradually divergent apically. Left hemitergite (10 L) 

 darkly pigmented, quadrate; produced caudad as a broad, twisted 

 process (10 LP) curled ventrad along outer apical margin. Eight 

 hemitergite (10 R) large equilaterally triangulate, weakly pigmented, 

 especially along inner margin, which is deeply excised behind middle ; 

 process (10 HP) arcuate on inner and apical margin, produced as a 

 short claw not extending far to right of outer margin of process. A 

 narrow, darkly pigmented appendix, present in membrane of median 

 cleft, is feebly connected basally and apically with 10 'R.^ Ninth ster- 

 nite (H) broad, developed as a broad, apically truncate process (HP) 

 slanting to the right; right apical angle heavily sclerotized, micro- 

 echinulate; left apical angle membranous. Composite left cercus- 

 basipodite and left paraproct (LCB + LPPT) triangular, sclerotic, 

 isolated. Eight paraproct obsolete. Left cercus two-segmented; basal 

 segment (LCi) emarginated on inner side, clavate apically and bearing 

 about 15 echinulations along inner apex; terminal segment short, 

 tapered terminally, broadly united with basal segment. Eight cercus 

 with basal segment somewhat laterally compressed ; margins of basal 

 foramen greatly elongated, darkly pigmented; terminal segment 

 cylindrical, longer and narrower than that of left cercus. 



Female. — Unknown. 



Holotype.—Msile, on slide, U.S.N.M. No. 56760. 



Type data. — Finca Esperanza, Chiapas, Mexico, at light, in a coffee 

 plantation in a virgin forest, August 3, 1935 (A. Dampf). 



Paratypes. — Two males on slides with holotype data but collected 

 on March 12, 1938. One deposited in the writer's collection, the other 

 in that of Dr. Alfons Dampf. 



Remraks. — This species, named for Dr. Alfons Dampf, of the 

 Escuela Nacional de Ciencias Biologicas, Mexico City, can be dis- 

 tinguished at once from all the other known Chelicercas by its two- 

 segmented left cercus. 



Subgenus Chelicerca, sensu stricto 



CHELICERCA (CHELICERCA) DAVISI (Ross), new combination 

 Anisemhia {Chelicerca) davisi Ross, 1840b, p. 656, figs. 26-28. 



Holotype.^Winged male, on slide, U.S.N.M. No. 53979. 



Type data. — Collected in gardenias from near El Fortin, Veracruz, 

 Mexico, in plant quarantine at Brownsville, Tex., January 16, 1937. 



CHELICERCA (CHELICERCA) NODULOSA, new species 

 FiGUEES 84, 87, 88 



Male (on slide).— Head, antennae, foretibiae, and terminalia me- 

 dium brown; prothorax pale straw yellow; pterothorax, wings, legs, 



» This is probably liomolosous to the isolated, sclerotic, heavily pigmented sclerite found 

 in this position in davisi and nodulosa. 



