52 
FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
mouth- parte much as in Orthosoma. Dorsal prothoracic plate ami the segment be- 
neath as in Orthosoiua, hut on each side in front of and above the prothoracic feet is 
a UUg6 hairy t aberole of which Orthosoiua has do traces. The remaining segments of 
the body abore and beneath are almost identical in form nnd markinga with those of 
Orthosoiua. The callosities on the upper side of the abdominal segments differ 
slightly in having the transverse areas not divided by a median impressed line, as 
they are in Orthosoiua (see PL xxxv, Fig. 1). The thoracic feel as in Orthosoiua, but 
the spiracles are much larger in proportion. 
Head as in Orthosoiua, except that the front edge of the epierauiuin next to the 
clypcus is smooth and straight, not dentate, as in Orthosoiua (PI. xxxv. Fig. \a). 
Clypeusand lahrum identical iu form with those of Orthosoma. but the stiff bristh-> on 
the front edge of the labium are considerably longer. Antenna- three-jointed and as in 
Orthosoiua, as is the shape of the labium with its two-jointed palpi; the latter, how- 
ever, much stouter, though not reaching beyond the end of the labrum. Maxilla 
as iu Orthosoiua, but the four-jointed palpi are a little stouter. Length of body, 
87 mm (3jo inches); breadth of prothoracic segment, 20 1 "" 1 . 
2. THE BROAD-NECKED PRIONUS. 
Prio**s laticoUis (Drury). 
Fir.. 13.— Broad-necked Prionus. its larva and pupa. After Riley. 
Though usually living in the roots and trunks of the poplar and balm- 
of-Gilead, Mr. F. Clarkson states that at Oak Hill, Columbia County, 
N. Y., this borer infests the black oak, the beetle emerging at twilight 
during the first two weeks in July. 
Their presence is quickly realized by the odor of the female, which is very power- 
ful, and can readily be detected 20 feet distant. I placed a female immediately 
after emergence in an uncovered jar. and wherever I positioned it, on the piazza or 
elsewhere, the males were attracted from every directiou. I captured twenty males 
