On Aquatic Carnivorous Coleoptera or Di/tiscidce. 351 



female in this species ; the front and middle tarsi are slender in all the specimens I 

 have examined. 



This species is very closely allied to Dytiscus unistriatus, but is rather paler in 

 colour than oven the palest varieties of that species ; the male tarsi are undilated ; 

 and the fossa (or transverse depression) behind the middle coxal cavities is much 

 deeper than in that species. 



Southern Europe : Sicily, Southern France, (Nimes, Beziers, Biaritz and Pyrenees). Algeria, Marooco, 

 117. 



263. Hydroporus pumilus, Aube, M.C. — Ovalis, brevis, latus, sat nitidus, fere 

 nudus, rufo-testaceus, pectore elytrisque infuscatis, his fortiter punctatis maculis 

 tribus externis rufo-tesiaceis. Long. 2, lat. li m.m. 



In this species I see no sexual difference, the tarsi being slender in all the 

 individuals I have seen. 



Near Vienna is found a form which may perhaps prove to be a distinct species ; 

 it is considerably narrower in proportion, and has the sculpture of the upper 

 surface less dense : I have not however seen sufficient, individuals to enable me to 

 form a positive opinion. 



Southern France, and Spain. 118. 



264. Hydroporus exornatus, Keiche, M.C. — Ovalis, subtilissime pubescens, tes- 

 taceus, pectore, thoracis basi medio elytrisque infuscatis ; his crebre fortiter 

 punctatis, maculis jalurimis pallidioribus. Long. 2, lat. li m.m. 



The male has the front and middle tarsi a little dilated ; of the female there are 

 two forms, one quite dull and with the punctuation of the upper surface less 

 distinct, while in the other the sculpture scarcely differs from that of the male. 



Syria, (Beyrouth), Crete, Turkey. 119. 



265. Bidessus coxalis, n. sp. — Ovalis, fusco-niger, thorace testaceo, basi medio 

 infuscato, elytris fasciis interruptis testaceis ornatis, antennis fuscis basi testaceo, 

 pedibus testaceis tarsis obscurioribus ; elytrorum lateribus distincte curvatis ; 

 coxis posterioribus medio sparsim, fere fortiter punctatis ; elytris dense subtiliter 

 punctatis. Long. If, lat. 1 m.m. 



This species is allied to Hydroporus minutissimus, Germ., (No. 267) but is shorter 

 in form, darker in colour, and has the punctuation of the hind coxae coarser, more 

 distinct and less dense, the sculpture of the upper surface is also less fine and 

 dense. 



Spain, (Madrid). North Africa, (Tangiers). 120. 



