ORSILOCHUS. 17 
This genus has a considerable resemblance to Pachycoris; the second and third joints 
of the antenne, however, are subequal in length, and the head is also more triangular, 
robust, and convex, which serve as superficial characters by which to separate the two 
genera. 
1. Orsilochus variabilis. 
Pachycoris variabilis, H.-S. Wanz. Ins. iv. pp. 9 & 10. figs. 353, 354’; Germ. Zeitschr. i. p. 88.117; 
Dall. List Hem. i. p. 32. 6°. 
Orsilochus variabilis, Stal, En. Hem. i. p. 9%. 
Var. a. punctatissimus. (Tab. I. fig. 9.) 
Pachycoris punctatissimus, Dall. List Hem. i. p. 32. 7, excl. syn.’ 
Var. 6. marginellus. 
Pachycoris marginellus, Dall. List Hem. i. p. 82. 8°; Stal, En. Hem. i. p. 7’. 
Var. c. complicatus. (Tab. I. fig. 8.) 
Pachycoris complicatus, Ubler, Proc. Ent. Soc. Philad. ii. p. 361°. 
Hab. Muxico 123455 (Mus. Berol.); GUATEMALA, San Gerénimo, Vera Paz (Champion); 
Costa Rica, Caché (Aogers).—CoLoMBIA *. 
This species is subject to great variation; the forms figured are vars. punctatissimus 
and complicatus, the first from Mexico, the second from Costa Rica. The var. margi- 
nellus, Dall., differs from punctatissimus in having a central pale longitudinal line, and 
a transverse black patch on each side near anterior margin of pronotum. The habitat 
of the type was unknown ®; but the probability necessarily is that it is found in the same 
region with the other varieties. The type is slightly larger than usual forms of P. punc- 
tatissemus; but only one specimen exists in the British Museum, though Walker (Cat. 
Het. i. p. 47) records three other specimens of the form from Mexico. An exami- 
nation, however, shows that Walker, under the names of P. boscit (where he inserts 
punctatissimus as a synonym) and P. marginellus, has fallen into terrible confusion, 
and mixed not only P. punctatissimus and P. marginellus in each case together, but also 
with them species of other genera. His habitats are therefore useless; and this expla- 
nation is necessary for not recording them. The var. complicatus is a larger and more 
robust form, the size as stated by Prof. Uhler being length 11 millims., hum. breadth 
62 millims.; the apex of the scutellum appears rather more abruptly deflexed; and the 
punctuation of the pronotum in some specimens is slightly different. But intermediate 
forms between all these varieties exist, and a fine series (all from Mexico) received 
from the Berlin Museum afforded an excellent opportunity of certifying the same. 
The colour beneath also varies from dark greenish black to slightly mottled luteous. 
BIOL. CENT.-AMER., Rhynch., April 1880. 3 
