PHILOTHALPUS.—GASTRISUS. 359 
13. Philothalpus pederiformis. (Tab. IX. fig. 1.) 
Rufus; capite abdominisque summo apice nigris, elytris viridi-cyaneis, pectore et antennis fuscis; capite tho- 
raceque crebre subtiliter punctatis, hoc linea longitudinali impunctata parum discreta; elytris abdomineque 
dense subtiliter punctatis. 
Long. 13 millim. 
Hab. Mexico, Cuernavaca (Sallé). 
Antenne elongate and slender, deeply infuscate red. Head with rather numerous, 
somewhat fine, evenly distributed punctures, leaving only a small space on the middle 
free. ‘Thorax punctured rather more finely than the head ; terminal segment of hind 
body blackish, with the base red; anal styles also black. Breast infuscate. 
A single pair only is known. The male has only a very slight emargination of the 
apical segment; but the front tarsi are broader than in the female. 
GASTRISUS. 
Gastrisus, Sharp, Trans. Ent. Soc. Lond. 1876, p. 136. 
This genus has hitherto consisted of three Amazonian species. The two species I 
now add differ from the type of the genus by the more slender and elongate terminal 
joint of the labial palpi; and they have quite a different appearance from either of 
the previously described forms. 
1. Gastrisus opaculus. (Tab. IX. fig. 2.) 
Fusco-sneus, parum punctatus, opacus; abdomine apice sordide rufo-testaceo, pedibus antennisque fuscis. 
Long. 17 millim. 
Hab. Panama, Volcan de Chiriqui (Champion). 
Antenne very obscure red, scarcely thicker towards the apex, but with joints 7-10 
rather shorter than broad ; clypeal membrane large. Head with punctures along the 
inner margins of the eyes and at the hind angles, and with two longitudinal series con- 
verging towards the front of the clypeus. ‘Thorax near the front margin with a series 
of three distant punctures on each side, and with a few punctures between these and. 
the front angles. FElytra very dull, with very distant and quite obsolete punctures. 
Hind body finely and evenly, not closely, punctate; the hind margin of the sixth 
segment, the whole of the seventh, and the anal styles rather obscure reddish yellow. 
Legs very obscure red, with the tibize darker, the spines of the middle tibie numerous 
and elongate. 
A series of six examples has been found. ‘The male has a very shallow emargination 
at the tip of the last ventral plate, and its front feet are a little broader than they are 
in the female. 
