HORN EXPEDITION—COLEOPTERA. 
277 
Mas. (?) ovalis, lat. 34 1. 
Femina lata, lat. 4 1. 
This is the only Nyctozoilns T have seen liaving tlie sixth joint of its antennse 
strongly transverse. The discal impressions on the prothorax in both the 
examples before me are peculiar in appearing to be below the general surface at 
their hind margin only and to be gradually ettaced forward ; this is (partly at 
least) due to the general surface being a little elevated or gibbous just behind 
them. 
Storm Creek, Stevenson River. 
N. approxiniatus^ sp. nov. (2), Fern. ? Opacus, partibus elevatis corpore subtus 
pedibusque sat nitidis; niger, antennis yiedibusque picescentibus; capite pro- 
thoraceque fere ut praicedentis (N. crassicornis) seel etiam magis obsolete magis 
sparsim punctulatis; liujus foveis discoidalibus vix manifestis ; capite inter oculos 
longitudinaliter leviter inipresso; antennis prothoracis basin fere superantibus 
articulis 1 *^ 2 *^ que parvis (his conjunctis quam 3^*® fere duplo brevioribus), articulis 
4° -7° gradatim brevioribus quam latioribus (4° multo, 7° paullo) longioribus 
(40 50 qyg conjunctis quam 3^® subbrevioribus), 8 ° transverso quam 7 “® sat breviori 
vix latiori, 9° 10° que inter se lequalibus transversis quam 8 °® et brevioribus et 
angustioi'ibus, 11 ° obovato quam 10 °® sat longiori; elytris fere ut pnecedentis sed 
costarum interspatiis vix rugulosis; feinoribus tibiisque baud tomentosis; prosterno 
inter coxas bisulcato (sulco intermedio fere nullo). Long. 61 1. Lat. 41 1. 
It will be seen from the above description that this species is very like N. 
crassicornis^ but diflers from it very widely in the structure of its anteniue and the 
absence of tomentosity on its legs as well as in several minor characters—the 
presence of an impression on its head, the almost even surface of its prothorax, 
the still fainter puncturation of its head and prothorax, etc. I should have 
been disposed to regard the two as perhaps the sexes of one species, if it 
were not that it seems impossible to account for one of the specimens of N. 
crassicornis being notably narrower and more elongate than the other, except on 
the supposition that those two are male and female. 
Camp 4, Camp 23. 
N. incBqualis, sp. nov. ( 1 ), Mas. ? Opacus, partibus elevatis corpore subtus 
pedibusque sat nitidis ; niger, antennis pedibusque picescentibus ; capite protho- 
raceque fere ut N. crassicornis sed multo magis perspicue punctulatis; hujus disco 
utrinque ante basin transversim gibbo; oculorum orbitu extus angulato; antennis 
