On Aquatic Carnivorous Colcoptera cr Dytiscvte. AGL 
In this species the tarsi of the male are distinctly broader than they are in the 
female, the species is extremely similar to Hyphydrus pubescens, (No. 568) but 1s 
rather more coarsely punctured above, has the antennee rather more slender, and 
the third joint of the tarsi not so small. 
North Europe; (Sweden, Finland, Germany). Russian North America. Ascends to 68° 20’ accord- 
ing to Sahlberg. 383. 
568. Hyphydrus pubescens, Gyll., Hydroporus pubescens, M.C.—Ovalis, sat con- 
yexus, minus nitidus, crebrius pubescens, eequaliter, subtiliter fere dense punctatus, 
niger, pedibus obscure rufis, antennis fuscis basi rufo, elytris fusco-brunneis, humeris 
sepe dilutioribus ; coxis posterioribus sat crebre, fortiter punctatis, abdomine 
seomento ultimo argute profundeque punctato ; tarsis anterioribus articulo tertio 
parvo. Long. 3%, lat. 1s m.m. 
This is a variable species in size and colour; in the more southern part of its area 
it has frequently the elytra broadly pale at the shoulders. 
It has been thought that this species is the Dytiscus melanocephalus, Marsh. 
(Hydroporus melanocephalus, Steph.), but as the descriptions leave this quite doubt- 
ful, I have not thought it advisable to disturb the generally accepted decision which 
considers Gyllerhall the first describer of the species. It has also been stated that 
the species intended by Gyllenhall under the name H. pubescens was not this but 
Hydroporus discretus, Fairm. (No. 564) ; Gyllenhall’s description however applies 
better to the present species than to any other, and there is therefore no sufficient 
ground for changing the name. 
Europe ; one of the most abundant of the European Dytiscide : Algeria, Northern Persia ; ascends in 
Finland to 67°, (Sahlberg) ; Germany, Britain, France, Corsica, Sardinia, Spain, Italy, Greece. 382. 
569. Hydroporus lituratus, Brullé, M.C.—Ovalis, sat convexus, minus clongatus, 
sat nitidus, tenuiter haud dense pubescens, subtiliter sat crebre punctatus, niger, 
pedibus antennisque testaceis, his apicem versus fuscis, elytris fuscis, vel fusco- 
testaceis, basi lateribusque plus minusve late et irregulariter testaceis ; coxis 
posterioribus sat crebre et fortiter punctatis ; abdomine segmento ultimo indistincte 
punctato. Long. 32, lat. 2 m.m. 
This is a very variable species in colour, and even in sculpture and pubescence, 
and its dark varieties approach very closely to Hyphydrus pubescens, but the 
present insect has the last segment of the hind body always much more indis- 
tinctly punctured ; the sexes are very difficult to distinguish. 
Bedel assigns to this species the trivial name of tessellatus Drapiez. 
Europe ; Northern Africa; Persia; Arabia ; (Scotland, England, France, Corsica, Spain, Cyprus, 
Sinai, Northern Persia, Jeddah). 381. 
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