of the Amazons Valley. 103 



are produced into spines ; the surface is finely punctate-granu- 

 late, and of the same colour as the thorax ; the grey spots are 

 nearly all of equal size and distinct ; but they are collected 

 partly into groups, and here and there confluent; the grey 

 apical margin is of equal width from the sutural to the external 

 angle. Body beneath thinly clothed with grey pile; sides of 

 breast not striped with thicker tomentum. Legs black, ringed 

 with grey. 



c? . Terminal ventral segment truncated, angles produced into 

 short spines; dorsal segment rounded. Anterior tarsi mode- 

 rately dilated and fringed. 



S. Paulo, Upper Amazons. Very closely related to C. navi- 

 gera, differing only in the oblique truncature and somewhat 

 different arrangement of spots of the elytra. 



31. Colohothea crassa, n. sp. 

 C. major, robusta, nigra, tomento olivaceo-griseo vestita, vertice tho- 

 raceque dorso lineis duabus divergentibus, elytris maculis nu- 

 merosis, minimis, discretis, fulvo-griseis, apice cano marginatis. 

 Long. 8-10 lin. c? $ . 



Differs from C. navigera in being of much larger size, in the 

 spots of the elytra being very much smaller and more numerous, 

 and in the dorsal lines of the thorax being posteriorly divergent. 

 •In shape and in colour the two species offer no tangible point 

 of difference. As in C. rmvigera, there are only two thoracic 

 lines visible from above, although there is a lateral line on each 

 side and a broader streak above the coxae (yellower in colour 

 and extending to the abdomen) ; the form of the terminal abdo- 

 minal segment in both sexes offers also no difference in the two 

 species. C. crassa is still more closely allied to a Cayenne spe- 

 cies, C. lineatocollis* (Dej. Cat.), which is similar to it in size 

 and other respects, and differs chiefly in the multitudinous grey 



* 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, nigraj, articulo sexto albo annulato. Thorax lineis 

 tenuibus duabus dorsalibus subparallelis, alteris duabus lateralibus, 

 vittaque utrinque supracoxali, griseis. Elytra postica modice at- 

 tenuata, huraeris parum obliquis, apicibus truncatis, angulis extcrnis 

 dentiformibus, supra sparse punctata maculis minutis griseis con- 

 fluentibus, reliquo spatio subapicali immaculato, ipso apice albo mar- 

 ginato. Corpus subtus liigmm, gi-iseo sparse tomentosum, abdomine 

 macidato. Pedes nigri, griseo annulati. Maris segmento dorsali ter- 

 minali truncate, angulis prominulis; ventrali profunde emarginato, 

 angulis spinosis. Fccminae segmento ultimo dorsali apice lato j ven- 

 trali profunda emarginato, angulis productis. Hab. in Cayeuna. 



