AQUATIG COLEOPTERA 
COLLECTED BY M. J.-C. PURVES 
IN ANTIGOA, DURING THE SUMMER OF 1872 
DAVID SHARP M. B. 
— SÉANCE DU 1° SEPTEMBRE 1877 — 
DYTISCIDÆ. 
1. Cybister Lherminieri Cast. 
2. Cybister lævigatus OI. 
3. Acilius circumscriptus (Latr.) Aubé. The specimens found 
by M. Purves belong to two varieties, in one of which the female is 
deeply, in the other only very slightly sculptured. 
4. Acilius margineguttatus Aubé. 
5. Laccophilus americanus Aubé. 
6. Suphis cimicoides Aubé. 
7. Hyphydrus n. sp. À widely distributed species belonging 
like the other New World Æyphydri to a genus distinct from that 
of the Old World species. The species found by M. Purves occurs 
also in Mexico and will be described in my Revision of the family. 
HALIPLIDÆ. 
Haliplus robustus n. sp. Rotundalo-ovalis, posterius acuwmi- 
nalus, ferrugineus, elytris minus distincte nigro-lineatis, et sub- 
maculatis, seriatim punctatis, interstliliis parce punctatis. Long. 
3-3 1/2 mm. lat. 1 2/3-2 1/4 mm. 
Head rather paler than the thorax, yellow, sparingly punctured, 
the eyes not very widely distant. Thorax much narrower than the 
elytra, greatly narrowed towards the front, darkish yellow, with 
an obscure fuscous spot on the middle of the front margin, and 
