424 HETEROMERA. 
1. Narses subalatus. (Tab. XIX. figg. 15,4; 16a, labium; 16 4, maxilla 
and maxillary palpus.) 
Elongate ovate, rather convex, reddish-brown, more or less stained with piceous, the suture of the elytra usually 
lighter, moderately shining. Head finely and closely punctured; eyes very widely separated ; prothorax 
subcylindrical, rounded at the sides, widest at the middle, distinctly canaliculate, very deeply so behind 
and there ending in a short semicircular shallow or deeper impression, the basal fovez small and shallow, 
the surface very finely and sparsely punctured ; elytra moderately long, ovate, widest at the middle, flat- 
tened towards the base, with rather coarsely punctured striz, the punctures much more scattered and 
still coarser towards the apex, the interstices almost flat throughout and each with a median row of 
very fine punctures; beneath more shining, sparsely and minutely punctured, the metasternum very 
coarsely at the sides and in the male exceedingly closely and finely so in the middle ; the fifth ventral 
segment unimpressed in both sexes; legs and antenne fusco-ferruginous, the femora often darker. 
3. Anterior tibie as in the female. The lateral lobes of the last ventral segment stout, spoon-shaped ; the 
central sheath rather broad, the apical portion subparallel but very slightly widened and spoon-shaped 
towards the end. 
Length 73-8 millim.; breadth 23-3 millim. (¢ 9.) 
Hab. Guatemaa, Totonicapam 8500 to 10,500 feet, Quiche Mountains 8000 feet 
(Champion). 
Hight examples. 
HYMENORUS. 
Hymenophorus, Mulsant, Mém. Acad. Lyon, 1851, i. p. 201; Opusc. Ent. i. p. 68 (1852). 
Hymenorus, Mulsant, loc. cit. p. 201; loc. cit. p. 188; Hist. Nat. Col. de France, Pectinipédes, 
p- 33 (1856) ; Leconte, New Sp. Col. p. 137 (1866). 
The numerous species here referred to this genus are connected together by various 
intermediate forms. The larger and more elongate members, such as H. occidentalis, 
H. tarsalis, &c., seem to connect Allecula and Hymenorus; but with the long series 
of species before me they are clearly much more closely allied to the latter. In 
Allecula there is a greater disparity between the width of the thorax and elytra (in 
Hymenorus the thorax is broader behind and forms a more continuous outline with 
the elytra, and consequently the general shape is more ovate), and the antenne are 
comparatively longer, more slender, and more filiform. The apical joint of the 
maxillary palpi in several of the larger species (H. occidentalis, H. sordidus, H. lati- 
collis, &c.) is very broad (with the apical side rather longer than the outer side), and 
formed almost as in Allecuda, in others more triangular, and with the apical and outer 
sides about equal in length; in a few of the smaller species (H. punctatissimus &c.) 
the inner apical angle is more rounded. ‘The third and fourth joints of the anterior 
and intermediate tarsi and the penultimate joint of the posterior tarsi are more or less 
lobed beneath, often more broadly so (H. tarsalis &c.) in the male. The first joint of 
the hind tarsi is in some species longer than the following three joints united. 
Good sexual characters exist in many of the species in the larger size and greater 
approximation of the eyes, and in the shape of the tibie, in the male; and in 
discriminating the numerous closely allied forms it is often necessary to ascertain 
the sex of the specimens examined. The eyes vary greatly in size in the different 
