LeConte.j HYLURGLNT. 377 



But one genus is represented in our fauna: 



PHLCBOTRIBUS Latr. 



The eyes are transverse, oblique, and not emarginate. Two species are 

 known to me ; both clothed with stiff pubescence. 



A. Lamellate joints of club very long ; tibiae finely serrate. 

 Elytra with striae of large punctures, interspaces nearly 



flat, rugosely punctulate, sides and apex feebly ser- 

 rate, prothorax finely punctulate 1 . liminaris. 



B. Lamellate joints of club short, not more than twice as wide as long ; 



tibia? coarsely serrate. 



Elytra with striae of large punctures, interspaces narrow, 

 serrate with single rows of small acute granules, sides 

 and apex strongly serrate ; prothorax finely not densely 

 granulato-punctate 2. frontalis. 



1. P. liminaris Lee., Tr. Am. Ent. Soc. 1868, 148; Tomicus liminaris 

 Harris, Inj. Ins. ed. ult. 88. 



Middle States, depredating on peach trees, and according to Miss Marga- 

 retta Morris (Downing's Horticulturalist, iv, 502), producing the disease 

 called the yellows. Length 2.2 mm. ; .85 inch. 



2. P. frontalis Zimm., Tr. Am. Ent. Soc. 1868, 148 ; Bostrichus fr. 

 Fabr., Syst. El. ii, 389; Scolytutfr. Oliv., Ins. No. 78, 13, PI. 2. f. 20; 

 Phlceophthorus granicollis Eichhoff, Berl. Ent Zeitschr. 186S, 149 ; Phlceo- 

 tribus gr. Chapuis, Mem. Soc. Roy. Sc. Liege. 



,3\ Head broadly concave, armed with a small erect acute spine each side 

 above the insertion of the antennae ; the spines vary in length, according 

 to the individual. 



9 . Head nearly flat, with a faint crescentic impression. 



District of Columbia, Georgia, Iowa ; found in Missouri by Mr. Rile}*, 

 depredating on mulberry. I have mentioned Pklceotribus setulosus and 

 ditbius Eichhoff, (Berl. Ent. Zeitschr. 1868, 149), as synonyms of this spe- 

 cies ; but from the memoir of Dr. Chapuis, above cited, I learn that these are 

 really South American species. The locality given by Mr. Eichhoff is there- 

 fore incorrect, and his descriptions are so indefinite as to render my error 

 quite excusable. 



This species is of the same size and form as the preceding, but is readily 

 recognized by the differences in the antennal club and in the sculpture of 

 the prothorax and elytra. 



Group III. Hylnrgi. 



In this group the form varies from oval to cylindrical; the antennae are 

 inserted at the sides of the front, immediately before the eyes, which are 

 large, transverse, slightly or not at all emarginate, and finely granulated. 

 The scape of the antennae is long, and is received in a narrow, transverse 

 groove in front of the eyes; this groove becomes more developed in the next 



PROC. AMER. PHILOS. SOC. XV. 96. 2V 



