HYMENORUWS. 425 
species: in some they are very large (especially in the male), and in others small 
and widely separated in both sexes. The third and fourth joints of the antenne are 
about equal in length, the third being rarely (H. tibialis) a little shorter than the 
fourth. With one exception (H. pini), the whole of the Central-American species 
have the surface of the thorax more or less densely punctured; in the majority of 
those inhabiting the United States the thorax is more sparsely punctured, and in con- 
sequence more shining. 
The head-quarters of Hymenorus in the New World would appear to be in Mexico, 
the genus extending northwards to the Middle United States, and southwards to 
Nicaragua. In the State of Panama I did not obtain a single representative. Eleven 
species (nine of which have been kindly communicated to me by Dr. Horn) have been 
described from the United States, and two or three are known from Europe or Asia 
Minor, and others, as yet unnamed, exist in collections; two of the North-American 
forms are stated to be of myrmecophilous habits. 
1. Hymenorus occidentalis. (Tab. XIX. figg. 17, 17a, ¢.) 
Elongate, obscure reddish-brown or brownish-piceous, scarcely shining, thickly clothed with short pubescence. 
Head very closely and finely punctured; eyes large, rather narrowly separated in the male, a little more 
distant in the female; antenne stout, rather short in both sexes, ferruginous; prothorax large, convex, 
broader than long, the sides much rounded anteriorly though nearly straight behind, the hind angles rather 
obtuse, the disc transversely flattened before the base, the basal fovew shallow or indistinct, the surface 
very densely and rather finely punctured; scutellum closely punctured; elytra long, a little wider than 
the prothorax, subparallel in their basal half, with rows of fine oblong punctures placed upon very 
shallow strie, the interstices almost flat, and very closely, finely, and confusedly punctured; beneath 
more shining, closely and finely punctured, the sides of the metasternum much more coarsely so, the 
middle of the metasternum in the male exceedingly closely and minutely punctured and very thickly 
pubescent ; legs stout, reddish-testaceous or ferruginous. 
¢. Anterior tibie slightly sinuous within. The lateral lobes of the last ventral segment narrow, mode 
rately curved, bluntly rounded at the apex, and roughened and hairy beneath; the central sheath 
narrowing to the apex, the apex blunt. (Fig. 17a*.) 
Length 9-11} millim.; breadth 3}-83 millim. (¢ 2.) 
Hab. Nortu America, Texas (coll. F. Bates).—Mexico (Sallé, ex coll. Sturm), Cordova, 
Guanajuato (Sal/é). 
Three specimens only from Mexico, several from Texas; one of the former (very 
immature) is labelled Allecula brunnea, Sturm, in the Sallé collection. Texan 
examples in Mr. F. Bates’s collection are labelled Allecula, nov. sp., apud Horn. 
This species has the thorax rather large, much rounded at the sides, and very densely 
punctured ; the elytra finely punctate-striate, and with the interstices very closely 
punctured; the legs comparatively stout; and the last joint of the maxillary palpi 
very broad, with its apical side longer than the outer side. 
* The figure given is not quite correct: the pieces on either side of the base of the central sheath are not 
separated from the segment as they should be. 
BIOL, CENTR.-AMER., Coleopt., Vol. IV. Pt. 1, November 1888. 3II 
