On Aquatic Carnivoroics Coleoptera or Dytiscidce. 543 



sculpture. The colour varies a little, the front margin of the head, and the sides 

 of the thorax being more or less obscurely reddish, and the sides of the ventral 

 segments more or less conspicuously spotted with red : and by careful examination 

 a minute yellow sublateral spot beyond the middle of the elytra may generally be 

 detected. 



Australia. 813. 



765. Agabus latissimus, Cllc, M.C. — Subrotundatus, minus convexus, niger, elytria 

 macula parva pone medium testacea, antennis pedibusque rufis, capite anterius 

 prothoraceque lateribus piceis ; densius subtiliusque reticulatus ; prothorace brevi, 

 cum elytris omnino continuo, angulis posterioribus per-acutis, ad elytra arete 

 applicatis; prosterni processu lato, fere piano, apice pevacuto. Long. 8, lat. 5 mm. 



The male has the front and middle tarsi slightly incrassate, and the basal joints 

 furnished beneath with short glandular hairs ; on each side of the ventral segment 

 there may be seen a few short rather obsolete strife. The female I have not seen. 



This species, so remarkable by its broad, rounded outline, seems very closely allied 

 to Platynectes daemeli, from which however its superior size, and the denser 

 reticulation of the upper surface distinguish it. 



Australia. 81-1. 



766. Agabus dissimilis. Shares, Tr. Ent. Soc. Lond. 1873, p. 50. — Late ovalis, 

 depressus, pernitidus, fere Isevigatus, niger, antennis pedibusque quatuor anterioribus 

 rufis, jiedibus posterioribus piceis, capite, thoraceque angulis anterioribus flavis, illo 

 utrinque nigricante, elytris plus minusve testaceo-ornatis ; thorace brevi, cum elytris 

 omnino continuo, basi utrinque versus angulos posteriores baud sinuato, his vix 

 acutis, margine laterali vix elevate ; prosterni processu lato, piano. Long. 5, lat. 

 3i m.m. 



The male has the front and middle tarsi very slightly incrassate, and furnished 

 beneath with short glandular hairs, and in it the apical ventral segment has some 

 oblique striae on each side. 



The species bears some resemblance to the smaller, broader, and more depressed 

 of the forms of Dytiscus decempunctatus (No. 763), but is considerably smaller and 

 more depressed, very smooth and shining, with the side margin of the thorax more 

 obsolete, and the i-ed colour on the head more extended ; the marks on the elytra 

 are very variable, sometimes there is a transverse yellow basal fascia, and an apical 

 spot, and several more or less interrupted longitudinal lines, but these elongate lines 

 are often quite absent, and the basal fascia may also entirely disappear, or may be 

 represented by one or two spots ; the apical yellow mark more or less connected 

 with a lateral line abbreviated in front, is the most constant mark on the wing-cases. 



Japan, China, Northern India. 815. 



