498 On Aquatic Carnivorous Coleoptera or Dytiscide, 
672. Agabus americanus, Aubé, M.C.-—Oblongo-ovalis, nigricans, nitidus, antennis 
palpisque rufis, pedibus anterioribus rufo-piceis, posterioribus fere nigris ; prothorace 
lateribus subrectis, angulis posterioribus obtusis, rotundatis, margine laterali elevato; 
elytris nullo modo reticulatis, levigatis, punctis subseriatis conspicuis. Long. 82, 
lat. 4 m.m. 
The male has the basal joints of the front tarsi a good deal incrassate, and much 
compressed, and rather extensively furnished beneath with short glandular 
pubescence ; the anterior claws are rather elongate and sinuate. The terminal joint 
of the middle tarsi is elongate and slender. 
I have seen only Aubé’s type of this species, which appears to be a very distinct 
one, by the smooth shining surface, and the indistinct rounded hind angles of the 
thorax. 
Mexico, (coll. Mnizech). 1154. 
673. Colymbetes seriatus, Say, Agabus seriatus, M.C.—Oblongo-ovalis, niger, 
supra eenescens, nitidus, antennis palpisque rufis, pedibus piceis; prothorace 
lateribus obliquis, basi subtruncato, angulis posterioribus rectis; elytris subtilius 
reticulatis, versus apicem evidentius reticulatis, sed neque opacis nec rugosis. Long. 
9, lat. 42 m.m. 
This species is closely allied to Dytiscus guttatus (No. 670), but is rather larger, 
and has the sculpture of the upper surface finer, and similar in both sexes; the 
prosternal process is larger and more acutely pointed at its apex. The male has 
the three basal joints of the front and middle tarsi a little thickened and furnished 
beneath with glandular hairs; the anterior claw of the front feet is a little dilated 
near the base so that its lower edge is slightly sinuate. 
The species seems to be widely distributed in North America and is somewhat 
variable in form and sculpture. 
North America. (Canada, California). 727. 
674. Agabus perplexus, n. sp.—Oblongo-ovalis, niger, supra eenescens, antennis 
pedibusque piceis ; prothorace brevi antrorsum angustato, angulis posterioribus sub- 
rectis ; elytris dense subtiliter reticulatis, retis versus apicem haud omnino minutis, 
Long. 9, lat. 5¢ m.m. 
In the male the basal joints of the front and middle tarsi are distinctly thickened 
and furnished beneath with glandular hairs ; the anterior claw of the front feet has 
the basal portion slightly thickened, so as to cause the outline beneath to be slightly 
sinuate. The species is closely allied to Colymbetes seriatus, but the lateral portions 
of the metasternum are not quite so much reduced in size. 
North America, (California, Vancouver's Island). 
