OLIARUS. 93 
Parallel; vertex slightly longer than broad, projecting a little beyond the eyes, which are large, light-coloured, 
and slightly emarginate behind ; vertex, frons, and pronotum dark, with the margins and the frontal keel 
testaceous; frontal ocellus distinct ; scutellum dark or fuscous, with five distinct keels, which are some- 
times lighter than the disc; tegmina transparent, with the veins distinct and finely granulated, and with 
a dark spot at the margins behind the middle; abdomen for the most part’ black ; legs testaceous, more 
or less infuscate, 
Afale with last ventral segment deeply emarginate, the emargination truncate and produced in the middle ; 
the styles large and long, and much dilated at the apex. 
Long. cum tegm, 4-44 millim.; lat. ad hum. 14 millim. 
Hab. Muxico, Atoyac in Vera Cruz, Chilpancingo in Guerrero (H. H. Smith). 
The waxy secretion of the female seems to be very abundant for so small an insect. 
A single female from Teapa ought, perhaps, to be referred to this species, although it 
is slightly larger and somewhat different. 
I have received specimens of a closely allied form from Mr. Ball, from British Guiana 
and Peru; these, so far as I can judge from Stal’s description, should be referred to 
O. lunatus (Fabr.), and it is possible that our insect may have to be referred to the 
same species. O. concinnulus appears, however, to be darker-coloured and to differ 
somewhat in the apical venation of the tegmina. 
3. Oliarus propior, sp.n. (Tab. X. figg. 16, 16a, 3, 3.) 
O. concinnulo affinis, sed major, vertice latitudine distincte longiori, oculis magnis; scutello plus minusve 
distincte quinque-carinato; tegminibus pellucidis, venis distinctis, fuscis, apicem versus haud evidenter 
granulatis ; abdomine nigro ; pedibus testaceis, plus minusve fuscatis. 
Mas segmento ultimo emarginato ad medium acute producto, stylis magnis, robustis, apicibus fortiter 
dilatatis. 
An obscure species, larger than the preceding, with the vertex longer than broad and the eyes large; scutellum 
with the interior pair of carine not always very distinct ; tegmina transparent, with fuscous veins, which, 
at any rate towards the apex, are scarcely visibly granulate; abdomen black; legs testaceous, more or 
less infuscate. 
Male with the last ventral segment of the abdomen deeply emarginate, with a sharp process in the centre, the 
styles long, robust, and very strongly and almost circularly dilated at the apex. 
Long. cum tegm. 6-7 millim.; lat. ad hum. 13-2 millim. 
Hab. Mexico, Chilpancingo in Guerrero, Teapa in Tabasco (H. H. Smith), Atoyac 
in Vera Cruz (Schumann). 
I cannot separate the specimens from Atoyac from the others, but in two males from 
the latter locality the process in the centre of the emargination of the last segment is 
shorter and thicker, and in one the styles are extraordinarily developed. We figure 
an example from Chilpancingo. 
4. Oliarus lacteipennis, sp. n. (Lab. X. figg. 17, 17 a.) 
Pracedenti affinis, sed paullo minor, vertice mazis subquadrato, tegminibus alisque lacteis, facile distin- 
guendus. 
Very like the preceding, but with the vertex distinctly more quadrate, and less prominent before the eyes; the 
scutellum has the inner carine more strongly marked; tegmina milky-white, semitransparent, with the 
BIOL. CENTR.-AMER., Rhynch. Homop., September 1904. ¥13 
