4 
On Aquatic Curmvorous Coleoptera or Dytiscide. 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, Clk., M.C.—Subrotundatus, minus convexus, niger, elytris 
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 arcte 
applicatis ; prosterni processu lato, fere plano, apice peracuto. Long. 8, lat. 5 m.m. 
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 strive. The female I have not seen. 
This species, se 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. 814. 
766. Agabus dissimilis, Sharp, Tr. Ent. Soc. Lond. 1873, p. 50.—Late ovalis, 
depressus, pernitidus, fere leevigatus, niger, antennis pedibusque quatuor anterioribus 
rufis, pedibus 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 haud sinuato, his vix 
acutis, margine laterali vix elevato; prosterni processu lato, plano. Long. 5, lat. 
33 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 strize 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, znd the red 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. 
