HYLASTES. 143 
Funiculus six-jointed ; club compressed, oval; eyes bipartite. . . . . . Phrixosoma. 
Funiculus five-jointed. 
Anterior coxe contiguous; club compressed . . . . . . . « + « Dendroctonus. 
Anterior coxe not contiguous. 
Club articulate. 
Club small, not compressed . . . 1. 7 ee ee ee eee) Xylechinus. 
Club large, compressed. . . 1. 2 ew ee ee ee ee) Phleosinus. 
Club solid, compressed, flattened, articulated by the upper margin beyond 
the basal extremity . 2... 1. 1 1. ee we ew ew ee) ~Chramesus. 
Antennal club loosely articulate. 
Basal joint of the club trigonate, as long as broad ww ww wwe SCS Eulytocerus. 
Basal joint of the club strongly transverse . . . . . «. . . . « « Phleotribus. 
HYLASTES. 
Hylastes, Erichson, Wiegm. Archiv, 1836, 1, p. 47; Chapuis, Syn. Scol. p. 16 (Mém. Soc. Liége, 
1873, p. 224) ; Leconte, Trans. Am. Ent. Soc. i. p. 174 (1868). 
Hylastes and Hylurgops, Leconte, Rhynch. N. Am. pp. 388, 389. 
This well-known genus, numerously represented in North America, is limited in 
extent in Central America by the distribution of the coniferous trees on which its 
members feed. Six species represent it at present, the examples of which were taken 
chiefly in Mexico, but also in Guatemala; one, however, has occurred in Panama. ‘The 
name //ylastes, in general use since the days of Erichson, has been recently changed by 
some writers to that of Tomicus, Latreille, who is stated to have applied that name first 
to this genus and a few years later to the insects generally known as Tomicus, but 
which have been lately referred to Ips. 
In his ‘ Bestimmungstabellen der Borkenkafer aus Europa, u. s. w., Herr Reitter has 
removed [ylastes from the Hylesinides to associate it with Crypturgus and Thamnurgus. 
As neither of these genera occurs in our region, it is unnecessary at present to 
examine into the merits of this novel grouping, which appears, at least as regards 
Thamnurgus, to be based on superficial resemblance rather than upon any valid 
structural affinity. 
Division I.—Species with the third tarsal joint narrow and cordate, the 
mesosternum not prominent. (L/ylastes, s. str.) 
1. Hylastes longipennis, sp. n. 
Linearis, niger, rostro carinato, prothorace subangusto, antrorsum attenuato, sat fortiter umbilicato-punctato, 
punctis insequalibus, linea media levi subelevata ; elytris striato-punctatis, interstitiis parum convexis, 
multipunctatis, tenuiter rugulosis, in declivitate granulatis et seriato-setosis. 
Long. 4°5 millim. 
About the size of, but more slender than, H. ater, Payk. Black, the elytra sometimes piceous, with very short 
scanty yellowish pubescence. Head closely but not strongly punctate; rostrum carinate at apex, some- 
