Horn.] 5o2 [April 19, 
The epistoma is rather deeply emarginate in Stowtdi, in the other species 
truncate or broadly emarginate. 
By an arrangement of the above characters our species may be tabu- 
lated in the following manner : 
Antenne eleven-jointed. 
Third joint of antenne much smaller than the fourth, joints 3-8 to- 
gether longer than the club. 
Prosternum behind dilated (All@ocnemis). 
Thorax punctured on the disc and shiny.:..........-. Stoutii %. 
Thorax cranilarandlopaque:s sd. eae ee to eee ate «eect ovrcollis 2 . 
Third joint of antennee equal to the fourth, joints 8-8 together shorter 
than the club. Prosternum not broader behind. 
Declivity of elytra not acutely margined. 
Thorax punctate at middle....... Rec sreericis olaisiers(ceeteite ..- punctatus. 
Thorax granite scr... 2etcuvaniie Sich dadepicdic tees cide pubescens®. 
Declivity of elytra acutely margined. 
Elytra coarsely, densely and roughly punctured. 
Marginal ridge of declivitiyshontsc..<lc6 2% low sts mire =. exesus, 
Marginal ridge of declivity long.......... dondGo00 00 a6 obliquus. 
Elytra sparsely and coarsely punctured, transversely plicate at the 
BIGES tei lonrsteriae re eateries encape ee Be ecahe aareeieule sicher ares plicatus. 
Antenne 10-jointed. Joints 3 and 4 equal. 
Joints 8-7 together not longer than the club. Elytra not margined at 
GCI Valbiyine-cxcteccasrntero)s a lehayaet onkey aie ter eeatenss sce rete che, rerere tenes confertus. 
P. Stoutii Lec. <'. Proc. Acad., 1858, p. 283; ovicollis Lec. 9°. 
Pacif. R. R. Rep., 1857, p. 49. 
This species is the largest in our fauna. The color is deep black. The 
elytra are gradually rounded at declivity without any elevated ridge at the 
sides. The two sexes appear so distinct that a separate mention will be 
made of each. Length .38-.76 92, .60-.84 ¥ inch; 10-19 mm. to 15-21 
mm. 
Male. Head large, equaling the thorax in size. surface rather coarsely 
granulate but not opaque ; clypeus concave rather deeply emarginate at 
middle ; mandibles stout and moderately prominent. Thorax moderately 
shining, disc punctured at middle, at sides and beneath granulate. Elytra 
shining, sparsely and rather finely punctulate. 
Female. Head not as large as the thorax, surface opaque, rather coarsely 
granulate ; clypeus flat, feebly emarginate at middle ; mandibles not promi- 
nent. Thorax opaque, granulate over the entire surface. Elytra opaque, 
scabrous, sub-granulate near the base. 
The head and thorax have erect black hairs sparsely placed, the elytra 
very finely pubescent. This latter is, however, rarely seen, as the hairs 
are very easily destroyed. I have never observed any sexual characters 
other than those mentioned above. The anterior femora appear to be a 
little stouter in the male, but this is not very evident. It has long been 
suspected by me that these were sexes of one species, so that in the 
