On Aquatic Carnivorous Coleoptera or Dytiscide. 825 
“Species S. lanioni affinis, sed corpore magis ovato (antice, et in elytris et in prothorace, angustiore), 
elytris obscurioribus, minus nitidis, et rugose imbricatv-asperatis, pedibus (ciliisque in posterioribus) 
picescentioribus. A S. coriaceo (Europeo et Canariensi) differt corpore minus obtuse oblongo (v.e., antice 
angustiore) omnino minus nigro, capite distinctius maculato et prothorace ad latera ferrugineo, necnon 
etiam in elytris obscure pallido-irroratis, prothorace paulo minus transverso, postice minus sinuato 
(angulis basalibus rectioribus) scutello sensim minus triangulari, et elytrorum impressionibus (in 
seriebus tribus dispositis) magis rotundatis, punctiformibus.” 
[A further description and comparison follows, l.c., the preceding. | 
From which it appears that the single female—all that is known of the species—“ appears to be in- 
many respects exactly intermediate between S. coriaceus (of Southern Europe and the Canaries), and 
the Madeiran 8. lanio.”—D. S. 
1506. Suphis puncticollis, Crotch, Tr. Am. Ent. Soc., 1873, p.397. North America. 
«“ Ovate, convex, testaceous, shining ; elytra piceous ; thorax and elytra coarsely and tolerably closely 
punctate. LL. -12 inch.” 
According to a specimen recently communicated to me by Dr. Leconte, this is a very distinct species 
of Canthydrus, perhaps best placed near Suphis lineatus, Horn (No. 48); the thorax has an infuscate 
area on the front of the middle, and the elytra are marked with a transverse irregular yellow mark, 
starting from the side in front of the middle but not reaching the suture ; the punctuation of the 
prothorax is only conspicuous on the basal portion, but that of the elytra is very conspicuous.—D. 8. 
1507. Suphis semipunctatus, Lec., Proc. Am. Phil. Soc., 1878, p. 599. North America. 
“‘ Blongate-oval, not pointed behind, moderately convex, yellow-brown, shining, smooth ; elytra darker, 
covered from the middle to the tip with scattered coarse punctures ; of which one series extends to the. 
base half way between the margin and suture. Prosternum not punctured, less dilated behind than in 
the other species, but with two short posterior striz ; metasternum with a deep impressed median line, 
smooth, with only a few scattered punctures behind. Length 2-6 m.m. ; ‘10 inch.” 
“Monroe, Michigan ; one specimen ; very different from the other species by the regularly oval form, 
scarcely narrower behind than before, by the peculiar punctuation of the elytra and by the impunctured 
sterna. The last joint of the maxillary palpi is nearly acute at tip, and does not appear emarginate from 
any point of view.” 
This is probably a species of Canthydrus, not of Suphis.—D. 8. 
1508, Thermonectes intermedius, Crotch, (basilaris var.), Tr. Am. Ent. Soc. IV, p. 402. California. 
“Thorax without the medial line (of Dytiscus basilaris), elytra with a humeral vitta and a mere trace 
of the basal fascia ; undersurface rufo-testaceous.” 
This is cited as a distinct species in the check list of North American Coleoptera ; but according to a 
specimen recently communicated to me by Dr. Horn, it is considered by me a variety of Dytiscus 
basilaris (No. 1071).—D. 8. 
1509. Trochalus rugulosus, Redt., Hug. Kasch. IV, 2, p. 502. India. 
“ Ovatus, olivaceus, subtus niger, thoracis elytrorumque margine laterali, ore, antennis, palpis pedibus- 
que anterioribus flavo-ferrugineis ; elytris subtilissime rugulosis. Long. 104'".  Caschmir.” 
“Den kleinsten Individuen des Troch. africanus, kaum an grosse gleichkémmend und nebst bei nach 
hinten bedeutend erweitert, so dass sein umriss der vollkommenen EHiform beinahe entspricht. Die. 
