( 94 ) 



but with distiuct traces of the pnbescence, which has proliably been rubbed off. 

 The most prominent character of the species is the presence of the strongly marked 

 costae on the elytra. 



Those from Ecuador were taken sitting on the leaves of low plants. 



4. Alurnus humeralis sp. uov. 



Head and antennae black. Thorax transverse, centre convex, sides of disc 

 depressed; a well-prodnced tooth on posterior angle; surface rugosely punctate, less 

 marked on convex portion; colour deep rod, niargiu of base Idack. 



Scntellum black, punctate. 



Elytra broader than thora.x, slightly sinuate below shoulders, margin slightly 

 reflexed, rngosely pnnctate at base, the punctation becoming finer towards apex: 

 hnmeral ])rucess well developed. Pearly white, a black spot on humeral process, 

 surrounded by a reddish ring; a black spot on each elytron hehind the centre. 



Legs and under surface black; soles reddish brown. 



Long. 35 mm.; lat. hum. 13 mm.; antennae 13 mm. 



Hab. Cachabi and Faramba, N.W. Ecuador. Generally taken at rest on leaves 

 of low plants : frequently seen on sunny days flying at a considerable height. 



Nearest to ^i. satmdersi, but may be at once distinguished by the humeral 

 spots, and by the position of those on the elytra, which are behind the middle in 

 -1. humeralis, whilst they are before the middle in .4. saundersi. 



Some specimens have the apical margin of the thora.\ black ; one or two of 

 these have the black basal and apical margin connected by a black streak along the 

 centre of the disc. A few specimens have only the centre of the scntellum black, 

 the remainder being red; in one of these the humeral spots are also red. The 

 reddish ring which surrounds the humeral spot varies considerably in extent, in some 

 cases being almost obsolete, whilst in one or two specimens it margins the whole 

 base of the elytra. There is also mnch variation in the size of the central spots of 

 the elytra, but their position is always the same. The type has a narrow dark brown 

 line on the apical margin of the elj'tra, bnt this is absent in many specimens. The 

 humeral spots are constant. 



The elytra are pearly white in living specimens, but become yellowish when 

 they are dried. 



5. Alurnus boucardi sp. nov. 



Head black, rugosely punctate in front. Antennae less than hali' the length of 

 the body. Thorax entirely black, sides dilated, anterior angle obtuse; posterior half 

 slightly depressed laterally, rugose-punctate behind, pnnctnred in front. 



Scntellum black, thickly punctate. 



Elytra pale yellow (probably white in living specimens, as in .4. humeralis); 

 general shape similar to A. saundersi, but hnmeral process rather more produced; 

 strongly marked costae are present, but they are not so pronounced as are those of 

 A. costalis; surface coarsely pnnctate, the punctures becoming finer towards apex; a 

 rather large black spot behind the middle of each elytron. 



Legs black; soles light brown. 



Long. 32 mm.; lat. hum. 13 mm.; antennae 13 mm. 



Hab. Colombia. T>/jjc in Tring:Museum, from Museum Boucard. 



