PINE BORERS. 



703 



Perris) ; upper edge overhanging and irregularly denticulated. Clypeus subchiti- 

 UOU8. Labrum much broader than long, well rounded in front, with numerous stiff 

 bristles. Antennae three-jointed ; basal joint partly covered by a projection from 

 the epicraniuni ; second joint one-half as long and about three-fourths as thick as 

 the first ; third joint nearly three times as long as the second, somewhat barrel- 

 shaped, being contracted at base and obtusely conical at the distal end. Maxillse 

 with the lobe well developed, the lobe not being very broad, abundantly bristled, 

 and extending as far as the end of the third palpal joint. Maxillary palpus 4-jointed ; 

 third joint but slightly longer than the second, the fourth as long as the third, but 

 one-half as thick, conical, pointed at the end, and extending well beyond the closed 

 mandibles. Labium : nientum short and very broad ; ligula nearly as long as broad, 

 front edge well rounded. Palpi 2-joiuted ; basal joint thick and short, globose ; 

 second joint conical, contracted in the middle as if subsegmented. Mandibles acute, 

 slightly bidentate. Feet moderately stout, three-jointed, the two basal joints nearly 

 alike, the third conical, and bearing a single claw. Length of the specimen, 7.5™™ ; 

 width of prothorax, 11.5'"™ ; of prothoracic disk, 10™™ ; length of prothorax, 8™™ ; 

 length from base of head to tip of labrum, 4™™ ; width of head, 6™™ ; length of 

 antenn;e, .8™™ ; of leg, .6™™; width of mesothoracic segment, 12.5™™ ; of first abdomi- 

 nal segment, 11.5™™ : of fourth abdominal segment, 10™™ ; length of eighth abdomi- 

 nal segment, 4™™ ; of ninth, 8™™. 



Pupa. — Antennje bent near their end at right angles and laid across the end of the 

 elytra, the latter reaching to the middle of the hind tarsi. End of the abdomen ter- 

 minates in a singular ruffle-like expansion, armed on the edgas with sto. t spines. 

 Hind tarsi reaching to the middle of the fifth abdominal segment. The bodj consid- 

 erably curved. Maxillary palpi extended well beyond the end of the mandibles. 

 Prothorax with a broad-based spine on the side. The projecting parts of the abdomi- 

 nal segments with fine spines, and segments 3 to 5 with a pair of transverse, thin, 

 dark-brown chitinous patches. Length, 30™™. 



Beetle. — In this genus the hind femora are not deeply furrowed ; there are several 

 short elevated ridges on the inner surface, while the antennae are filiform. The pro- 

 thorax is tridentate, and the body is throughout light brown. The fifth ventral seg- 

 ment is rounded in the female, but broadly truncate in the male, leaving the sixth 

 visible. Length, .90 to 1.75 inches. 



33. Prion us emarginatus Say. 



Probably injuring shade or timber trees in Utah, a 

 dark brown beetle of the following appearance : 



Body castaneous ; head, thorax, and breast covered with long 

 yellowish ferruginous hair ; antennae fourteen-jointed, glabrous, 

 perfoliate, imbricate ; the imbrications emarginate beneath ; man- 

 dibles black at tip ; thorax but slightly margined, one-toothed 

 on the middle of the lateral edge ; angles obtusely rounded ; elytra 

 somewhat unequal, punctured ; feet and venter subglabrous. 

 Length, nearly seven-tenths of an inch. Female glabrous ; anten- 

 nae simple. Length, four-fifths of an inch. This species exhibits the 

 general form of brevicornis, but the thorax is proportionally much 

 narrowed, and the characters above detailed prove it to be very 

 distinct from that species. The lepaceous processes of the antennae 

 are so profoundly emarginate beneath as to appear each bilobate. 

 I obtained it on the Arkansas River near the mountains. (Say.) 



Fig. 239. — Frwiius 

 emargi nat us. — 

 From Packard. 



