32 ANNULOSA JAVANICA, 



63. Vittatvs- C. ater lavis elytris vittd sub-mar ginalifiava : macula baseos atra. 



Dytiscus vittatus, Fab. Ent. Syst. i. 190 14. 



, Oliv. Ins. 40. tab. i. fig. 5. 



Long. corp. \ 



Obs. The black spot on the yellow vitta in this species varies exceedingly. 



64. Fasciatvs. C. elytris flavis : fasciis duabus sutura punctoque apicis nigris. 



Dytiscus fasciatus. Fab. Ent. Syst. 1. 189,9. 



, Oliv. Ins. 40, tab. 2, fig. 19. 



Long. corp. i + 



Genus DYTISCUS. Lin. 



65. Gmsevs, D. cinereus thorace punctis duobus nigris elytris fascia dentata nigra. 



Dytiscus griseus, Fab. Ent. Syst. 1, 191, 16. 



, Oliv. Ins. 40. tab. 2, fig. 12. 



Long. corp. £ + 



Obs. This species appears to be very generally dispersed over the warmer latitudes, a? it 

 oecurs in my father's collection from Bengal, Bombay, Italy, Spain, France, and even from the 

 Island of St. Bartholomew, in the West Indies, where it was collected by Dr. Forstrom. This 

 West Indian specimen only differs from the rest in wanting the black spots on the thorax, which 

 spots are also evanescent in European varieties of D. griseus. 



66. Rugosus. D. nivro-viridis, clypeo thoracisque margine laterali flavis, elytris medio rugosulis vitta marginali 



interrupta. 



Long. corp. l T v 

 Caput atrum clypeo labroque flavis antennis palpisque pallidis. Thorax nitidus striis duabus laterali- 

 bus aliaque anteriori transversa leviter punctulatis. Elytra nigra limbo laevissimo nitido, striis tribu? 

 punctulatis exaratis, vitta marginali flava postice fracta apicem elytrorum haud attingente. Corpus 

 piceum lateribus pedibusque anticis pallidis. 



67. Limbatus. D. olivaceus thoracis elytrorumque margine Jlavo, abdomine atro : maculis lateralibus testaceis. 



Dytiscus limbatus. Fab. Syst. Eleuth. 1, p. 258, 2. 

 Dytiscus aciculatus. Oliv. Ins. 13, 6. tab. 3, f. 3(3. 

 Long. 1 1 



Stirps. 3. PHILHYDRIDA. 



Entomologists in general, with the exception of M. Latreille and his followers, have allowed 

 a close affinity to exist between this stirps and the Hydradephaga, and nothing but the difficulty 

 of making this affinity accord with the other parts of his system could ever have made so acute an 

 entomologist as M. Latreille to doubt so obvious a truth. Originally both these stirpes were 

 known under the common denomination of Hydrocanthari, and Linnaeus comprized all the 

 species under the generic name of Dytiscus, separating the groupe into two sections which cor- 

 respond with our stirpes Hydradephaga and Philhydrida. To these sections, in process of en- 

 tomological investigation, he gave the names of Dytiscus and Hydrous, but finally for this last 

 groupe adopted the word Hydrophilus, which had been already appropriated to them by Geof- 



frov 



