LeConte.J 



ARRHENODINI. 325 



Subfamily I. BREXTHID^ (genuini). 



Of this family two genera belong in the faunal limits treated of in this 

 memoir, though one of them {Brenth^s), is in a political sense extialimital, 

 having occurred in Lower California. 



These two genera represent in the arrangement of Lacordaire separate 

 groups, but in the plan of subordination of characters herein adopted, they 

 seem to indicate what 1 have called tribes, which may be distinguished by 

 the sexual and other dift'erences in the head, as well as by the torm of the 

 prothorax. 



Beak very dissimilar in the two sexes; antennae not very remote from 

 the eyes, rather slender, not compressed, nor clavate; prothorax convex, 

 not grooved AURUEXODlNl. 



Beak slender in both sexes; antennae far distant from 

 the eyes, somewhat thickened and stouter externally; 

 prothorax deeply grooved towards the base br£NTIIINI. 



Tribe I. arkhebtodini. 



The genus Eupsalis, represented in our fauna by a single species, differs 

 from Arrhenodes by the brilliant lustre of the surface, and by the hind part 

 of the head being less prominent; in view of the magnitude of tliL^ varia- 

 tions in the (^ (^, which I have mentioned below, I have great doubt of 

 the generic value of these characters; nevertheless, my opinion can only 

 be tested by a careful study of foreign species, which would interrupt the 

 progress of the present memoir, and is, moreover, not essential for the elu- 

 cidation of our own fauna. 



The distribution of Eupsalis, even as thus limited, is remarkabk'; one 

 species in North America, one species in Guinea, and one in Madagascar, 

 and perhaps one in Brazil. It is worthy of remark in this connection, that 

 the genus Amorphocephalus, the only Brenthide found in Euro2:)e, is also 

 represented in Australia.* 



EUPSALIS Lac. 



1. E. minuta Riley, 6th Mo. Report, 113; (larva correctly determined, 

 described and figured) ; CurcuUo minutus Drury, Ins. i, 95, Tab. 42, f 3, 7, 

 name given in index, vol. ii, (9 ); Herbst, Kafer, vii, 200; Tab. 108, f 9, 

 (9); Oliv. Enc. M6th. ii, 192; B. maxillosus Oliv. Ins. iv. No. 84, Tab. 

 1, f. 1, and Tab. 2, f. 17, (c^?); Gyll., Sch. Cure, i, 326. 



B- septemtrionis Herbst, Kafer, vii, 183, Tab. 108, f. 5, {(^y, B. bruntieus 

 Panzer, ed. Voet. iv, 44; B. distans Panzer, ibid. 



B. {Arrhenodes) septemtrionis Harris, Ins. Inj. Veg. 3d ed. 68; (larva er- 

 roneously determined and described) ; Eupsalis maxillosus Horn, Tr. Am 

 Ent. Soc. iv, 127. 



Abundant from Lake Superior to Texas, and from New England to Col- 

 orado; bores into the heart wood of various oaks, usually after they have 

 been felled, though sometimes while the tree is still living; the white, the 



* Lacordaire, Gen. Col. vii, 42.3. 



