32 ANNULOSA JAVANICA. 
63. Virrarus. C. ater levis elytris vittd sub-marginali flava : macula baseos atrd- 
Dytiscus vittatus, Fab. Ent. Syst. i. 190 14. 
, Oliv. Ins. 40. tab. i. fig. 5. 
Long. corp. 4 
Oss. The black spot on the yellow vitta in this species varies exceedingly. 
64. Fascratus. C. elytris flavis : fasciis duabus sutura punctoque apicis nigris- 
Dyftiscus fasciatus. Fab. Ent. Syst. 1. 189, 9. 
, Oliv. Ins. 40, tab. 2, fig. 19. 
Long. corp.3 + 
Genus DYTISCUS. Lin. 
65. Grisevus, D. cinereus thorace punctis duobus nigris elytris fascia dentata nigra. 
Dytiscus griseus, Fab. Ent. Syst. 1, 191, 16. 
ee OI Ve SEs tAUs Salle kee 
Long. corp. 4 + 
Ons. This species appears to be very generally dispersed over the warmer latitudes, as 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. Rucosus. D. nigro-viridis, clypeo thoracisque margine laterali flavis, elytris medio rugosulis vittd marginal: 
interrupta. 
Long. corp. 1,,. 
Caput atrum clypeo labroque flavis antennis palpisque pallidis. Thorax nitidus striis duabus laterali- 
bus aliaque anteriori transversa leviter punctulatis. Elytra nigra limbo lavissimo nitido, striis tribus 
punctulatis exaratis, vitta marginali flava postice fracta apicem elytrorum haud attingente. Corpus 
piceum lateribus pedibusque anticis pallidis. i 
67. Limpatus. D. olivaceus thoracis elytrorumque margine flavo, abdomine atro: maculis lateralibus testaceis. 
Dytiscus limbatus. Fab. Syst. Eleuth. 1, p. 298, 2. 
Dytiscus aciculatus. Oliv. Ins. 13, 6. tab. 3, f. 30. 
Long. 1 3 
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 Hydroeanthari, and Linneus 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 thei by Geot- 
froy 
