THE CANADIAN ENTOMOLOGIST 61 



longer. The thorax is back and lacks the yellow stripes. Also the prothorax 

 has no yellow margin, and only the raised edges, which separate the middle from 

 the side parts of the same, have in their posterior region a yellow colouring. The 

 Mesothorax is almost always very strongly arched but not so unusually as 

 in M. gracilis or M. crassus. Over the base of the wing on either side is a small 

 circular, yellow spot, and four of the same on the posterior margin before the 

 scutellum, of which the outer are the larger. Also the downwardly directed tip 

 of the scutellum is yellowish. The abdomen is of the same slender form as in 

 the preceding species, but entirely black with the exception of the narrow poster- 

 ior margin of the fifth vsegment, which is yellow; on the third and fourth segment 

 only the lower half of the posterior margin is yellow, and on the second segment 

 is likewise furnished with a yellow posterior margin. The legs are in general 

 dark brown, the tibicC lighter, the femora deep black, at the lower end with a 

 yellow ring; also the ends of the tibiae are yellowish. The wings are infuscated 

 and have a dark cloud in the middle. At first glance one could take this species 

 to be a colour variety of M. gracilis, but the height of the thorax is very different, 

 etc. 



"6. M. siibcylindricus Ph. M. niger, margine prothoracis, vittis interruptis 

 mesothoracis, margine posteriore lateribusque segmentorum abdominis cylindrici, 

 crassiusculi flavis; alis infumatis; pedibus luteo-ferrugineis, femoribus nigris. 

 Length of body 2^^ lines, expanse of wings 43^2 lines. 



"One specimen taken with the previous species. 

 "The head is black, frontal protuberance and proboscis yellow. The pro- 

 thorax has a yellow hind margin and now and then the anterior margin is yellow- 

 ish brown. The mesothorax is highly arched for this genus, somewhat as in 

 M. tristis, and has in front four abbreviated yellow stripes and four similar 

 stripes posteriorly. The margin of the scutellum and the sides of the mesothorax 

 are ^'ellow. The abdomen is not nearly so slender as in M. gracilis and tristis, 

 but much thinner than in M. pictus and crassus; the first segment is clearly 

 visible, the second broader than the following, but the same length as these, the 

 third, fourth and fifth are apparently as broad as long. The sides and posterior 

 margins of these segments yellow and the margins have a yellow spot in the 

 form of a triangle in the median section of the dorsum. The wings are infuscated, 

 unspotted, yet a darker cloud can be made out in the middle. The legs are dark 

 as in M. tristis. 



Through the kindness of Mr. F. Knab I obtained the loan of three specimens 

 of a species of Megalybus from Chile which I have mentioned in the first part of 

 this paper. They are probably M. gracilis Phil, and I give a description below: 



Head blark, occiput ring-like and with a rim next to the prothorax (see fig. 1). 

 The occiput is finely punctate and with fine white pile. Eyes with fine, short 

 white pile, the facets very small. Ocellar tubercle triangular and raised only 

 slightly. The head appears round from in front and more than a hemisphere 

 viewed in profile. The small triangular frons projects somewhat and is black 

 at the base, the lower half being ivory white. The antennae are small, yellowish 

 brown, contiguous at the base, the first joint scarcely visible, the third ending 

 in the usual bristle. The eyes are separated below the antennae by almost the 

 width of the frons at the widest part (see fig. la). The proboscis reaches almost 

 to the tip of the abdomen, brownish at the base, otherwise yellowish, and ends 



