1863.] 
267 
the time when his (Mr. Uhler’s) remarks were printed, were, as he 
says, unknown to him. He adds that “ these appendages cannot be char¬ 
acteristic of sex as Dr. Hagen supposes, because most specimens are not 
furnished with them.” This last proof seems to me no proof at all. 
To make it conclusive, it ought to he shewn in addition that these ap¬ 
pendages occur hoth in % and 9 . Of course, Mr. Uhler’s statement 
that these appendages are also found in M. interrupta applies to the 
omjchium^ and it is no wonder that I could not find them in that spe¬ 
cies either S or 9 . 
APPENDIX. 
Hetaerina scelerata n. sp. {=11. americana Walsh, p. 210.) 
After the preceding pages were in press, Mr. Uhler was kind enough 
to send me at my request a pair % 9 of jST. americana. On comparing 
the % abdominal appendages with those of the % described page 210 , 
and doubtingly referred to americana^ I am satisfied that this doubt¬ 
ful S is a distinct and undescribed species (scelerata') for the following 
reasons:—Is^. In americana the laminiform medial tooth of the supe¬ 
rior % appendage has its sides convergent at an angle of about 45° for 
about two-thirds of its entire length, the terminal third part being 
rounded in a flattish or obtuse curve. In scelerata the sides of this 
tooth, instead of converging rapidly, are almost parallel for two-thirds of 
its entire length, but the terminal third part is rounded as in americana 
except that it is of course much wider. In both species the tooth is 
directed inwards and downwards and a little forwards, so that its true 
shape is only seen when viewed laterally in an oblique direction from 
above or below. Viewed either perpendicularly from above, or hori¬ 
zontally in profile, as in Dr. Hagen’s drawings of americana (Monogr. 
Calopt. Plate XII, fig. 3,) its proportions are foreshortened and altered. 
I find that the stray abdomen mentioned above page 212, and supposed 
to belong to hasalis, has theUaminiform tooth of the superior appen¬ 
dage identical with that of americana.^ viz. triangular with the apex 
truncate and obtusely rounded. 2nd. In americana., on the upper sur¬ 
face of the posterior base of this laminiform tooth, there is nothing 
hut a slight intumescence^ which on a cursory inspection would scarce¬ 
ly be noticed; in scelerata., as already stated page 211 , there is a dis¬ 
tinct hemispherical tubercle there, which is colored fuscous with the 
