170 
species. C. crassa is still more closely allied to a Cayenne spe- 
cies, C. lineatocollis^ Cat.), which is similar to it in size 
and other respects, and differs chiefly in the multitudinous grey 
specks of the elytra being confluent and forming irregular mar- 
bled lines. C. Osculatii of Guerin (Cat. des Ins. Col. recueillis 
par Gaetano Osculati, no. 261) appears to be another allied form 
similar in size and colours to C. crassa and C. lineatocollis ; but 
the description given of the thoracic markings quatre fines 
lignes longitudinales blanches ^^) leaves us in doubt whether 
there are not four lines on the upper surface, which would re- 
move the species from the neighbourhood of the two mentioned; 
for, if the lateral lines are to be included, the description ought 
to mention six instead of four. The distinctive character of C. 
crassa is the minute and equal size, great number, and equidis- 
tant position of the grey specks of the elytra. 
Common in the neighbourhood of Para. C. Osculatii is pro- 
bably a native of the banks of the Napo, where M. Osculati 
formed his collection. 
32. Colohothea ordinata, n. sp. 
C. elongata, postice attenuata, olivaceo- nigra, vertice postice bi- 
lineato ; thorace supra lineis quatuor crassiusculis vittaque lata 
supracoxali fulvo-cinereis ; elytris maculis numerosis subquadratis 
fulvo-cinereis in seriebus subordinatis ; thorace ante basin utrin- 
que breviter tuberculato. Long. 1\ lin. ^ . 
Head black, forehead with three slender lines, vertex with 
two divergent lines, and cheeks with a broad streak, tawny 
ashy ; there is also a tawny-ashy streak behind each eye. An- 
tennse stout, black, sixth joint with a narrow white ring, the 
bases of the fourth, eighth, tenth, and eleventh joints with an ashy 
streak on one side ( ). Thorax slightly constricted at the base, 
and with a small tubercle on each side ; surface black, with four 
rather thick tawny-ashy lines ; there is also a broad tawny-ashy 
^ Colohothea lineatocollis (Dej. Cat. sec. Dom. Chevrolat). Elongata, 
antice et postice attenuata, nigra, obscure olivaceo-grisea, sericea, 
griseo lineata et maculata. Caput nigrum, griseo lineatum, vertice 
lineis griseis duabus postice divergentibus, genis griseo plagiatis. 
Antennae validae, nigrae, articulo sexto albo annulato. Thorax lineis 
tenuibus duabus dorsalibus subparallelis, alteris duabus lateralibus, 
vittaque utrinque supracoxali, griseis. Elytra postica modice at- 
tenuata, humeris parum obliquis, apicibus truncatis, angulis externis 
dentiformibus, supra sparse punctata maculis minutis griseis con- 
fluentibus, reliquo spatio subapicali immaculate, ipso apice albo mar- 
ginato. Corpus subtus nigrum, griseo sparse tomentosum, abdomine 
maculate. Pedes nigri, griseo annulati. Maris segmento dorsali ter- 
minali truncate, angulis prominulis; ventrali profunde emarginato, 
angulis spinosis. Foeminae segmento ultimo dorsali apice lato ; ven- 
trali profunde emarginato, angulis productis. Hah. in Cayenna. 
