280 HETEROMERA. 
rather broader than long, 11 short ovate, very little longer than 10; elytra rather short; beneath with 
the metasternum, the sides of the posterior coxe in front, and the base of each ventral segment cinereo- 
pubescent, for the rest blackish-pubescent ; pygidium long, about twice the length of the hypopygium ; 
legs black, the tibial spurs piceous. . 
Length to end of the elytra 22, to tip of the pygidium 33, millim.; breadth 1 millim. 
Hab. Mexico, Teapa (7. H. Smith); Guatemata, Cahabon in Vera Paz (Champion). 
Four examples of this very obscure little species have been obtained. It is perhaps 
nearest allied to WM. dimidiata, from which it differs not only in colour but in the 
longer antenne and pygidium. The light-coloured pubescence on the elytra is limited 
to an obliquely placed V-shaped mark below the shoulder and a narrow line along the 
basal half of the suture. 
18. Mordella fluctuosa. (Tab. XII. fig. 6.) 
Moderately elongate, rather broad, black; the head cinereo-pubescent ; the prothorax with the apex narrowly, 
a narrow angulated line in front extending completely across (with the marginal line almost enclosing 
three transverse black marks), and a rather large triangular patch at the base on either side of the 
middle (extending forwards but not reaching the centre, and also laterally to the posterior angles) 
cinereo-pubescent, for the rest black; the scutellum cinereo-pubescent ; the elytra with two narrow 
strongly angulated cinereo-pubescent fascize—one some distance before and the other beyond the middle, 
the former not reaching the suture and with a short narrow branch laterally extending upwards to the 
base, the latter extending completely across and with the portion on the opposite elytron forming a 
W-shaped mark,—the suture very narrowly at the extreme base and the apical third with a little 
scattered cinereous pubescence, the rest of the pubescence black; the pygidium cinereo-pubescent at the 
base, black beyond. Palpi piceous, the last joint of the maxillary pair stout, triangular; antenne 
piceous with the basal four joints paler, short and slender, joints 3 and 4 very thin, long, and equal, 5-11 
wider, 5 triangular, longer than 4, 6-10 serrate, decreasing in length, the penultimate joints transverse ; 
elytra not quite two and a half times the length of the prothorax; beneath in great part cinereo- 
pubescent ; pygidium slender, pointed at the tip, moderately long, more than twice the length of the 
hypopygium ; legs black, the tibial spurs piceo-testaceous, the anterior tibie curved. 
Length to end of the elytra 3, to tip of the pygidium 32, millim.; breadth 14 millim. 
Hab. Panama, Volcan de Chiriqui (Champion). 
One example, probably of the male sex. Of the size and general appearance of 
M. acuticauda, but with very different cinereo-pubescent markings on the thorax and 
elytra, short serrate antenne, &c. MM. fluctuosa is perhaps nearest to WM. albo- 
picta, but it is less elongate and much smaller; the antenne and pygidium are much 
more slender, the elytral markings very different. 
19. Mordella acuticauda. (Tab. XII. fig. 7.) 
Moderately elongate, the female broader, black, somewhat sparsely pubescent; the head cinereo-pubescent ; 
the prothorax with the sides and base and a line along the disc on either side of the middle (not reaching 
the apex) cinereo-pubescent, for the rest black; the scutellum cinereo-pubescent; the elytra with three 
rather narrow cinereo-pubescent fascize—one at about one fourth from the base, curving forwards at the 
sides and extending to the shoulders, one at the middle, angulated or a little excised on its upper or 
lower edge, and one some little distance before the apex, the latter curving upwards and confluent with 
the opposite one at the suture, the anterior two nearly reaching the suture,—for the rest black; the 
pygidium cinereo-pubescent at the base, black beyond. Head very broad and convex, without distinct 
