364 HEMIPTERA-HETEROPTERA. 
(Champion); Costa Rica (Sallé, Van Patten ; Biolley, in coll. Distant), Rio Sucio, 
Caché (Rogers); Panama, Volcan de Chiriqui (Champion). 
With types of A. signoreti and A. vicinus before me, I am unable to distinguish 
more than one species. The slight differences mentioned by Mayr are probably 
sexual *: in the male the lateral portions of the sixth ventral segment (as well as the 
median) are longer than in the female, and this would account for the somewhat 
different position of the spiracles. 
The longer membrane (which varies a little in development and in the neuration) 
and the more sparsely pilose median portion of the venter separate A. signoreti from 
both the preceding species. The antennal processes are intermediate in length between 
these of A. ovatus and A. breviceps. 
PEDINOCORIS. 
Pedinocoris, Mayr, Verh. zool.-bot. Ges. Wien, xiii. p. 847 (1863) ; xxi. pp. 402, 405 (1871). 
The two described species of this genus are both from California, one of them being 
now known to extend southwards into Mexico. The antenne are 3-jointed, as in 
Deinostoma. | 
1. Pedinocoris macronyx. (Tab. XXI. fig. 22, antenna.) 
Pedinocoris macronyx, Mayr, Verh. zool.-bot. Ges. Wien, xiii. p. 350, t. 11. figg. 1-41; xxi. 
p- 405°; Uhler, Bull. U.S. Geol. & Geogr. Surv. i. p. 338°; Proc. Calif. Ac. Sci. (2) iv. 
p- 292*; Kirk. Entom. 1898, p. 2’. 
Hab. Norta America, California!?%, Lower California *, Arizona 5.—Mexico, Rio 
Mescales (Buchan-Hepburn), Cuesta de Misantla (M. Trujillo), Jalapa (Hoge). 
Of this species we possess six specimens from Mexico. They vary somewhat in the 
sculpture of the elytra, the single example from the Rio Mescales being more rugose 
than the others. Mayr! originally gave as localities “ California and Mexico,” but 
he subsequently stated ? that the last-mentioned habitat was incorrect. 
ZAITHA. 
Zaitha, Amyot et Serville, Hist. Nat. Ins. Hémipt. p. 430 (1843) ; Fieber, Gen. Hydroe. p. 20, 
t. 2c (1851) ; Mayr, Verh. zool.-bot. Ges. Wien, xiii. p. 852 (1863), and xxi. p. 406 (1871). 
Perthostoma, Leidy, Journ. Acad. Phil. n. s. i. p. 66 (1847). 
The species of this genus, which is probably restricted to the New World, are very 
closely allied and difficult to distinguish ; five occur within our limits. The females 
have the sixth ventral segment more or less truncate at the apex and usually with two 
small fascicles of hair at the tip. In the males the corresponding segment is rounded 
or subacuminate at the apex. 
* Mayr does not notice the sex-of the specimens he described. 
