252 ntocEEDiNcis of the national yrrsErM. 



PTEROSTICHUS CALATHOIDES Waterhousd'. 



Feronia calathoidrx WATERiiorsE, Ann. Nat. Hist., 1845, XVI, p. 21. 

 J'oecilus caJtiihoidex GEMMiN(iKU .and Hahold, Cat. Col., 1868, 1, p. 300. 



Elongately ovate, black, smooth, shining, very depressed above. 

 Antennae, labrum, palpi, and legs piceo-rufous. Thorax subquadrate, 

 sides arcnate and slightly convergent before the middle, parallel 

 behind; posterior angles rectangular, not carinate; disk with the 

 median line finely impressed and with a single long' basal fovea each 

 side, equidistant between the middle and the angles, entirely impunc- 

 tate. Elytra at base scarcely broader than thorax, obliquely dilated 

 for a short distance and then arena tely narrowed to apex; disk with 9 

 deeply impressed, impuuctate striae; intervals convex, smooth, the 

 second broader at base and with a short stria; the third stria with an 

 impressed puncture toward the base, the second with one at the middle 

 and another one toward apex, the eighth with the usual coarse punc- 

 tures. Ventral surface smooth, piceous black. Prosternum rounded 

 at apex; episterna of metathorax twice longer than broad. Male with- 

 out limbriae on the hind tibiae. Female with the elytra subopaque. 

 Wings aborted. 



Length, 11 mm.; width, 4.5 mm. 



Two exam[)les from Charles island, collected by the Alhatross expe- 

 dition in 1888, and 3 from Chatham island, collected by Dr. G. Baur. 

 If Chaudoir's genera are accepted, the species would belong to the 

 genus J>ysi(liiis. The island from which J)arwin obtained it is not 

 recorded. 



PLATYNUS GALAPAGOENSIS Waterhouse. 



Feronia tjalapagoemia Wateuiiouse, Ann. Nat. Hist., 1845, XVI, p. 21. 

 Poecihtx ijalaiHKjomxiH Gemminger and Harold, Cat. Col., 1868, 1, p. 302. 



Apterous, elongate, depressed, very smooth, black above, ventral 

 surface and legs rufo-piceous. Antennae ferruginous, with the three 

 basal joints glabrous. Thorax broad, liat, slightly longer than broad, 

 widest at middle, arcuately narrowed to apex, feebly convergent, nearly 

 j)arallel behind the middle; side margins narrowly rellexed; posterior 

 angles rectangular, obtuse at apex, flattened above; disk entirely 

 impuuctate, with a long basal fovea on each side nearer to the lateral 

 margin than to the middle; median line linely impressed; transverse 

 basal impression obsolete. Elytra elongately oval, with rounded humeri 

 and finely impressed smooth striae, the second stria with a puncture 

 behind the middle, the third with one toward the base; intervals flat, 

 finely alutaceous; apices feebly sinuate, slightly prolonged. Episterna 

 of metathorax somewhat longer than broad. Legs slender, moderately 

 long; the anterior tarsi without grooves, the middle and posterior tarsi 

 with lateral grooves. 



Length, 11 mm. 



One female, collected on Chatham island by Dr. G. Baur. On which 

 island Darwin collected the species is not recorded. 



