30 
side on the other thoracic segments; one each side of abdominal seg- 
ments one to seven and two, bearing two small bristles, on the last 
segment. There is also a semicircular row of four similar tubercles 
near the inner edge of the eyes and a transverse row of four between 
the eyes; two outward-curved medio-dorsal rows of four tubercles in 
each row on the prothorax; a transverse row of four tubercles on the 
meso- and metathorax; two median tubercles on the first three abdomi- 
nal segments and one on segments four to seven. The antenne are 
short, four-jointed, and inserted on the underside of the head. The 
two basal joints are short, stout, and subequal in length; the third is 
longest and slightly stoutest at the apex; the fourth is somewhat 
shorter, clavate, and terminates in a short, blunt spur; both are 
slightly annulated or serrate and bear a slender cylindrical thumb 
near the apex. Legs stout; the posterior tibize bear near the end two 
(& 
Fic. 15.—Hamamelistes spinosus: a, mature stem-mother, dorsal view; b, ventral view; 
c, antenna—much magnified (original). 
long, backward-curved bristles, and the tarsi a similar one on their 
external edge. The digitules of all the tarsi are long and capitate, 
the lower pair being much the finest. The rostrum is long and taper- 
ing and reaches beyond the posterior coxe. 
In the following two stages the larve have lost all of the secretory 
tubercles, which are to some extent replaced by hairs. In other 
respects they are very similar to the first stage. 
Adult stem-mother; fourth stage (Fig. 15).—The full-grown stem- 
mother is almost globular or broadly pyriform, about 2™™" long, and of 
a dark purplish-brown color, covered with a mealy secretion; antenne, 
legs, and rostrum blackish. Eyes small and composed of three ocelli. 
There are apparently two bristles on the front of the head, two 
each side of the thoracic, and one each side of the abdominal segments. 
The tail is small, broad, knob-like, and bears two bristles; the last 
segment is broadly bilobed, and each lobe is furnished with about 
