On Aquatic Carnivorous Coleoptera or Dytiscidce. 515 



712. Agabus {Gaurodytes) clypealis, Thorns., Sk. Col. IX, p. 107. — Ovalis, nitidu.s, 

 niger, prothorace subi^nescente, lateribus, capite ex pai'te majore elytrisque rufes- 

 ceutibus, his dorso late infuscatis, baud reticulatis, subtilissime punctulatis. 

 Long. ? lat. ? 



The male has the basal joints of the front and middle tarsi a little incrassate, 

 and furnished beneath with short haii's which bear distinct palettes, the claws of 

 the front feet are but little elongate, and are simple. The female I have not seen. 



The species is very similar to Agabus subfuscatus, but is shorter, and the male 

 front claws are less elongate, and the prosternal process is broader and shorter ; it 

 differs from Dytiscus congener (No. 706), by its prosternal process, and by the more 

 arched anterior border of the hind coxse which makes the side wino^s of the meta- 

 sternum shorter : it is also extremely similar to Dytiscus paludosus (No. 680), but 

 has the side wing's of the metasternum shorter, and the metasternal oToove longer. 



Northern Europe, (Sweden and Finland). 767. 



713. Dytiscus nebulosus, Forst., Ac/cdjus ncbulosus, 3£C, — Ovalis, hand con vexus, 

 nitidus, subtus niger, supra testaceus, elytris capiteque nigro-variegatis, prothorace 

 in medio stepius nigro-bimaculato, antennis pedibusque cum femoribus testaceis. 

 Long. 8h, lat. 4^ m.m. 



The markings on the wing cases consist of numerous irregular black spots ; the 

 under surface has the margins and sides of the ventral segments as also the articular 

 portions of the hind coxa3 more or less yellow. The male has the three basal joints 

 of the fi-ont and middle tarsi distinctly inci'assate, and furnished beneath with long 

 hairs which bear palettes at their extremity, the claws of the front feet are rather 

 long, and the anterior one is thickened or obtusely dentate at the extreme base. 

 In both sexes the surface of the elytra seems to be very smooth, but when a careful 

 examination is made it is seen that the females have the basal portion excessively 

 minutely and finely reticulate or coriaceous. 



Europe, Sardinia, Algeria, Syria, Canary Islands. (Sweden, Britain, Germany, France, Spain). 750. 



714. Dytiscus conspersus. Marsh., Agabus conspersus, M.C. — Ovalis, nitidus, 

 (femina interdum subopaca) subtus nigricans, supra flavicans, elytris plus miuusve 

 fusco-nebulosis, capite nigricante vertice testaceo-bimaculato, clypeo testaceo, 

 antennis pedibusque rufis, his femoribus plus minusve late infuscatis. Long. 8, 

 lat. 4} m.m. 



This species is variable in the colour of the upper surface which is sometimes, 

 with the exception of the variegated head entirely pallid, the elytra are generally 

 however suffused with vague dark marks, and sometimes the middle of the thorax 

 is also infuscate. The male has the front and middle tarsi with the thi-ee basal 

 joints a good deal incrassate, and furnished beneath with long hairs which bear 



TEANS. EOT. DUB. SOC, N.S., VOL. II. 3 3; 



