NORTH AMERICAN GYRINUS (cOLEOPTERa) 
.S()4 
])0 the gibber of LoCoiite, represented solely by the iinicpu' 
type; the gibbosity in the latter is, however, still more i)ro- 
nounced, the general form more convex, the cross section dis- 
tinctly angiilate at the suture. 
;t2. Gyrinus gibber LeConte 
Tlio uni(iue feinule S])ecimen described by LeConte under this name in 
1S68 seems never to liave been duidicated. The name is strikingly suggested 
by the Inxlily form, whicli is quite strongly gibbous in longitudinal j)rofile, 
a-nd is distinctly angulate at suture in transverse section. The type is of 
broadly oval form, the side margins widely reflexed, the surface only moder- 
ately shining, reticulato-alutaceous but without or nearly without fine punc- 
tulation; punctures of lateral striae not coarser. Body beneath metallic 
black, last segment dark brown, legs ferruginous. 
Length, 5 mm.; width, 2.9 mm. 
Type locality . — ^North Carolina (Zimmerman). 
Although rather extreme in its degree of giltbosity of outline, 
there is nothing besides this singularity to suggest malforma- 
tion, and I am hj no means ready to pronounce the specimen 
a freak, as has been done by Horn, in his “Notes from tlie 
Museum at Cambridge where he declares it to lie “simply a 
deformity of annlis.” Whether an abnormal individual or not, 
there is certainly nothing whatever to connect it with analis, 
and if it is to be assigned to any of the species here recognized, 
it is that to which 1 have given the name frosti. If the thick 
humped form of gibber is really an abnormality, then it is quite 
likely that frosti is the normal form; Imt with our present meagi'r 
knowledge of the Gyrind fauna of North C'arolina, it is unwise, 
to make such assumiition. 
d.'k Gyrinus impressicollis Kirby 
Broadly oval, moderately convex, side margins wide, outline less continu- 
ous than usual, there being a distinct but very obtuse angle at the junction 
of the prothorax and elytra. Above black, surface throughout slightly 
aeiKiscent, a little nion* distinc-tly so at lateral margins. Surface in femah' 
dislinctly reticulato-alutaceous and dnll, minute pnnetulation nearly lack- 
ing; inahi mor(> liiudy alufaceous, more shining, and with an evident minute 
punci Illation. Strial ininctuix's line, not nu'tallic, scai’ei'fv coarsen’ laterally, 
occupying at sides distinctly impresse'd groov'es, which bc'coine V('ry ieeble 
near the suture. Itod}’ bennadh nuhallic black, anal segment concolorous; 
legs ruloiis, a, taint ihisky ditt us(> cross ba r at basal t bird of middle and hind 
t highs; claws pieeous. 
**'rrans. .\m. Lnt. Soe., xii, Suppl. Broe. Knt. Sc'ct., p. xiii, (ISSli). 
