On Aquatic Carnivorous Coleoptera or Dytiscide. 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 even 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, Marocco, 
Wile 
263. Hydroporus pumilus, Aubé, M.C.—Ovalis, brevis, latus, sat nitidus, fere 
nudus, rufo-testaceus, pectore elytrisque infuscatis, his fortiter punctatis maculis 
tribus externis rufo-testaceis. Long. 2, lat. 14 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, Reiche, M.C.—Ovalis, subtilissime pubescens, tes- 
taceus, pectore, thoracis basi medio elytrisque infuscatis; his crebre fortiter 
punctatis, maculis plurimis pallidioribus. Long. 2, lat. 14 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. 1%, 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 coxze coarser, more 
distinct and less dense, the sculpture of the upper surface is also less fine and 
dense. 
Spain, (Madrid). North Africa, (Tangiers). 120. 
