58 THE CANADIAN ENTOMOLOGIST 



apparently two-jointed antennae, whose first two joints combined are hardly 

 twice as long as this knob; the second (actually the third) is rounded and ends 

 in a fine bristle. The proboscis is long, pointing back under the body, split 

 at the end into two thread-like lips, which are somewhat curled up. The palpi 

 are (as in M. pictus) very small, awl-shaped, horizontal. The thorax is as large 

 as the abdomen, extraordinarily gibbous, that is, the mesothorax is raised high 

 so that the abdomen forms a right angle with the forepart of the thorax; pro- 

 thorax, mesothorax and metathorax are clearly separated by sutures. — The 

 abdomen is cylindrical, thick or slender, six-segmented, but the first segment is 

 very short; all segments separated by deep incisures. — The wing venation is 

 nearest Cyrtus, but it is characteristic, namely the cell which takes in the tip of 

 the wing is not petiolate as in Cyrtus. The squamai are convex, thick, glass - 

 like. The legs are simple; the tibiae somewhat thickened at the end, entirely 

 unarmed, the claws large, there are two "Haftlappen." 



"The adult insect is found on flowers; the larvae live, it would seem in wood, 

 at least my son Karl, in Dec. 1863, found a fly of this genus just crawling out of a 

 tree. 



"1. Megalyhus pictus Ph. M. niger, helvolo-pictus, antennis capitesque 

 nigris, rostro helvolo; thorace vittis interruptis helvoHs notato; abdomine crasso, 

 maculis ternis triangulaiibus helvolis in quovis segmento picto; alis ante apicem 

 fascia abbreviata nigra ornatis; femoribus nigris, genubus, tibiis tarsisque flavis. 

 Length 3 lines, expanse of wings b]/2 lines. 



"Habitat in the province of Santiago. 



"The prothorax is clearly differentiated, black, rimmed light yellow, has a 

 short furrow in the middle, and its hind margin forms two corners. The meso- 

 thorax is of great height, has on the fore part four short, light yellow stripes, 

 of which the side ones are strongly curved, and as many shorter stripes in the 

 posterior part. The hind margin of the scutellum is yellow. On each side of 

 the scutellum is a yellow dot between the edge of the mesothorax and the glass- 

 like squamae. 



"2. M. crassus Ph. M. thorace maxime gibboso, rufo, strigis helvolis et 

 castaneis picto; abdomine crasso, supra nigro-castaneo, et in medio marginis 

 postici segmentorum macula parva triangulari flava notato, lateribus potius, 

 ferrugineo, marginibus flavescentibus, alis hyalinis fusco-bimaculatis; pedibus 

 e ferrugineo luteis. Length 3 1/3 lines, expanse of wings 83^ lines. (See figure). 



"Captured in province of Valdivia. 



"The head is brownish, the proboscis reaches three-fourths the length of the 

 body. The antennae are light brown and the prominence above them white. 

 The prothorax is light rust brown with whitish yelloAV margins; the mesothorax 

 is of the same ground colour and marked with the same whitish yellow 

 stripes as M. pictus, but in the middle is deep chestnut-brown, and is highly 

 arched in a very remarkable manner. The scutellum is dark chestnut brown, 

 with whitish yellow margins. Also the abdomen is dark chestnut brown, with 

 small triangular whitish yellow spots on the middle of the posterior margin 

 of the second, third, fourth and fifth segments, on the sides rust brown with pale 

 yellow margins. The wings have a blackish cross-band shortly before the tip, 

 which reaches to the anterior margin, but ceases some distance from the posterior 



