On Aquatic Carnivorous Coleoptera or Dytiscidce. 825 



" Species S. lanioiii affinis, seel corpora magis ovato (antice, et in elytris et in pi-othorace, angustiore), 

 elytris obscurioribus, minus nitidis, et rugose imbricato-asperatis, pedibus (ciliisque in posterioribus) 

 picescentioribiis. A S. coriaceo (Europfeo et Canariensi) differt coiijore minus obtuse oblongo {i.e., antice 

 angustiore) omnino minus nigro, capite distinctius maculato et protliorace ad latera ferrugineo, necnon. 

 etiam in elytris obscure pallido-irroratis, prothorace paulo minus transverso, postice minus sinuate 

 (angulis basalibus I'ectioribus) scutello sensim minus triangulari, et elytrorum impressionibus (in 

 seriebus tribus dispositis) magis rotvmdatis, punctiformibus." 



\A further description and comparison follows, I.e., 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. coi-iaceus (of Southern Europe and the Canaries), and 

 the Madeiran S. lanio." — D. S. 



^ 1506. Suphis punoticollis, Crotch, Tr. Am. Ent. Soc, 187.3, p. 397. North America. 



" Ovate, convex, testaceous, shining ; elytra piceous ; thorax and elytra coarsely and tolerably closely 

 pimctate. L. -12 inch." 



According to a specimen recently communicated to me by Dr. Leconte, this is a very distinct species 

 of Canthydrus, jierhaps 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 in-egular yellow mark, 

 starting from the side in front of the middle but not reaching the sutiu-e ; the punctuation of the 

 prothorax is only conspicuous on the basal portion, but that of the elytra is veiy conspicuous. — D. S. 



1507. Suphis semipunctatus, Lee, Proc. Am. Phil. Soc, 1878, p. 595. North America. 



" Elongate-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 strise ; 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 ; veiy 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 Supliis. — D. S. 



1508. Thermonectes intermedins. Crotch, (basilaris var.), Tr. Am. Ent. Soc. IV, p. 402. California. 



" Thorax without the medial line (of Dytiscus basilaris), elytra with a humeral ■vatta 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. S. 



1509. Trochalus rugulosus, Eedt., Hug. Kasch. IV, 2, p. 502. India. 



" Ovatus, olivaceus, subtus niger, thoracis elytronimque margine laterali, ore, antennis, palpis pedibus- 

 que anterioribus fiavo-femigineis ; elytris subtilissime rugulosis. Long. 10|"'. Caschmir." 



" Den kleinsten Individuen des Troch. africanus, kaum an grtisse gleichkommend iind nebst bei nach 

 hinten bedeutend erweitert, so dass sein umriss der voUkommenen Eiform beiaahe entspricht. Die. 



