224 HEMIPTERA-HETEROPTERA. 
Having been enabled to examine typical specimens of the two forms described 
by Stal, I can detect no specific differences of a structural character, but only what 
to me appears colour-variation, and that in a direction which is common in other 
species of the genus. Stal certainly did not, especially in his later years and more 
matured views, err in the direction of ultra specific nomenclature; and though these 
descriptions were published in 1861, the two described “species” are stated to be 
“ valde affinis.” Fig. 20 is that of the typical L. bipustulatus, Stal; and fig. 21 repre- 
sents the form described by Stl under the name of L. socius, and redescribed by Walker 
as L. pulverulentus. | 
FIBRENUS. 
Fibrenus, Stal, Ofv. Vet.-Ak. Forh. 1861, p. 195; En. Hem. i. p. 90 (1870). 
This is an easily recognized and well-marked genus, having the anterior coxe spined, 
and the anterior lobe of the pronotum in the male sex very tumid. 
Two species of Fibrenus are described, both of which have been received from Central 
America. 
1. Fibrenus globicollis. (Tab. XX. figg. 24, 25.) 
Largus globicollis, Burm. Handb. i. 1, p. 282. 2’. 
Fibrenus globicollis, Stal, En. Hem. i. p. 96. 1°. 
Hab. Panama (coll. Dist.), Bugaba (Champion).—CoLomBia, Buenaventura (Dr. 
Thieme, coll. Oberthiir) ; Braziu, Para 1 ?. 
This is a very variable species, and is closely allied to the following species, F. gibbi- 
collis, Stal; in fact, beyond its constantly smaller size, there is little structural character 
to warrant its separation. Stal?, in specifying the differences between the two species, 
writes “metastethio toto nigro, nec postice flavescente.” This is not the case with a 
long series of Bugaba specimens, though applying to other Panama examples in my 
own collection. Stal further observes, “segmentis flavescentibus ventris &c.,” which, 
on the contrary, apply to the Bugaba series, but not to the other Panama specimens 
referred to, in which the abdomen is totally black. Again, in the Bugaba form of the 
species the posterior lobe of the pronotum is red, whilst in my black-abdomened Panama 
specimens the posterior margin of that lobe only is red, as described by Burmeister. 
2. Fibrenus gibbicollis. (Tab. XXI. fig. 1.) 
Fibrenus gibbicollis, Stal, Ofv. Vet.-Ak. Férh. 1861, p. 198. 1’; En. Hem. i. p. 96. 27. 
Hab. Muxico1?, Oaxaca ?, Jalapa (Hoge), Valladolid in Yucatan (Gaumer); Britis 
Honpouras, river Sarstoon (Blancaneaux). 
This appears to be the northern representative of the last species, and is also of a 
very variable character as regards colour, though constant in respect of size. The 
variation principally applies to the pronotum, of which the posterior lobe has a broad 
red hinder margin, varying in that respect until in some specimens it is totally black. A 
specimen from British Honduras, somewhat intermediate in that respect, is here figured. 
