58 Mr. R. V. Chamberlin on new 
terminated by four sensory cones, while in the present genus 
the sensory cones are numerous. Articles of antenne six 
instead of seven. 
Genotype, H. errans, sp. n. 
Heligmasoma errans, sp. n. 
Because of long preservation the original colour of the type- 
specimens is doubtful. They appear to have been dark, 
perhaps of an olivaceous tinge with the caudal margins of 
tergites ferruginous. 
The head above is smooth and without puncte, excepting 
a few laterally. In going toward the labrum, however, the 
puncte become deeper and much more numerous. Antenne 
short, not stout, last joint slightly clavately wideued distad, 
with numerous small sensory cones. 
The collum with anterior margin curving forward and 
fitting into the superior depression of the head. Posterior 
margin curving in an even semicircle between the apices of 
the lateral angles. A fine margining sulcus along anterior 
border curving forward at the middle, though not so strongly 
so as the margin of the plate. Surface of the plate smooth 
and shining, or the punctz obscure, few, and scattered. 
Anterior elevated border of the second plate thick 
laterally, narrower in the middle region, as is that of lateral 
along lateral margin. The furrow behind it deep, widening 
laterally, its surface smooth and shining; border limiting 
furrow behind smooth, set off by a vague furrow. General 
surface of plate densely and deeply punctate. Other tergites 
also densely punctate. 
Anal scutum densely punctate, the surface also uneven or 
roughened. Lower or caudal border distinctly margined, the 
narrow elevated border smooth. 
Both the- basal and the apical divisions of vulva longi- 
tudinally subdivided. Mesal basal piece narrower, but much 
longer than the ectal, extending distad along the apical 
division and attaining or nearly attaining the level of the 
tip of the latter. Apical division proportionately small, 
subconical, the two halves scarcely differing in size. 
In the anterior gonopods of the male the two fingers are 
one-jointed. The movable finger is broadly conical, 
distally rounded, concave on the side toward the other 
branch. ‘I'he latter is much shorter than the other, toward 
which it is a little curved ; it is broad and distally rounded, 
and lies close to the other finger. The movable finger of the 
posterior gonopods is of the general form usual in Cyliosoma, 
