S/iecies of the American Genus Astylus. 347 



by the transverse reddish basal spot and the entirely bluish- 

 black outer margin of the elytra. The $ has a similarly un- 

 divided sixth ventral segment ; but the lateral lobes of the 

 tegmen are shaped much as in the same sex of A.cceruleotinctus, 

 which has an incompletely cleft sixth ventral segment in $ . 

 The above-mentioned colour differences also distinguish 

 A. nigrolimbatus from the last-named insect, the outer limb 

 of the elytra being partly flavescent or red in all the speci- 

 mens of A. bonplandi and A. cceruleotinctus before me. 



12. Astyhis-bourgeoisi. 



Astylus bourgeoisi, Kirsch, Abhandl. Zool. Mus. Dresden, 1888-89, 

 no. 4, p. 11, t. 1. fig. 20 ; Bourg. Bull. Mus. Paris, 1911, p. 212. 



Astylus bissexyuttatus, Gorh. in Wliymper's Great Andes, Suppl. App. 

 pp. 52, 53, fig. (1891). 



<$ . Ventral segment 5 broadly arcuato-emargjnate, 6 sub- 

 triangular, sulcate down the middle, notched at the tip. 

 Tegmen narrow, with long, compressed, subcontiguous lateral 

 lobes, which are eiliate and somewhat rounded at the tip. 

 Penis-sheath with the outer portion almost straight, sulcate 

 on the ventral aspect, abruptly narrowed at the apex. 

 $ . Ventral segment 6 short, simple. 



Hah. Colombia {ex coll. Sharp), Tuquerres (sec. Kirsch) ; 

 Ecuador, Quito, Cayambe, Mindo, Machachi, &c. 



This variable insect is common at high elevations (8000- 

 10,000 ft.) in Ecuador, many localities being given for it by 

 Bourgeois and Gorham, who figure similar well-marked 

 examples. The latter have on each elytron a patch at the 

 base, two transversely placed, oblong spots towards the 

 middle, and a large annulus before the apex, flavescent or 

 red, these markings being sometimes reduced to small spots, 

 three of which represent the broken-up annulus. The inner 

 submedian juxta-sutural spot is rarely wanting, and the elytra 

 themselves are coarsely punctured. Two dissimilarly 

 coloured males have been dissected, showing no variation in 

 the armature. 



13. Astylus riveti. 

 Astylus riveti, Bourg. Bull. Mus. Paris, 1911, p. 213. 



Moderately elongate, shining, pilose, the hairs on the 

 upper surface mostly black, with shorter decumbent greyish 

 hairs intermixed, those on the under surface and legs 

 cinereous; aeneous, the basal joints of the antennae entirely 

 or in part, and the others at the extreme base, rufous ; the 



