60 THE CANADIAN ENTOMOLOGIST 



margin, and a blackish cloud in the middle. The legs are entirely yellow, and 

 the femora hardly noticeably darker. 



"3. M. ohesus Ph. M. rufo-castaneus; antennisque nigris; thorace vittis 

 tribus nigris, maculisque sex helvolis picto ; abdomine crasso, ad medium margin- 

 um posticorum segmentorum macula parva helvola notato, ad latera immaculate ; 

 alis fusco-bimaculatis; pedibus rufo-fuscis, femoribus piceis. Length 31^ lines, 

 expanse of wings almost 9 lines. 



"Specimen prope Corral sestate 186^ lectum est. 



"The proboscis is yellowish, the frontal prominence over the antennae yellow- 

 ish white. Of the spots on the thorax two are before the scutellum, another on 

 either side before the base of the wing, and one on each side before the end of the 

 scutellum. The fifth abdominal segment has a narrow yellow posterior margin, 

 which coalesces with the yellow spot in the middle of the same. The abdomen 

 is dull, the base of all the segments is clothed with fine reclinate hair, which gives 

 the effect, that they shimmer gray in certain lights. This is the thickest and 

 largest species and separated from M. crassiis through the lack of yellow colour 

 on the sides of the margins of the abdominal segments. By closer observation 

 the whole colouring is seen to be quite different. 



''"4. M. gracilis Ph. M. corpore obscure brunneo; thorace quam maxime 

 gibboso, flavo-picto; abdominis tenuis, cylindrici, apici incrassati segmentis 

 lateribus helvolo-marginatis ; pedum luteorum femoribus supra f uscescentibus ; 

 alis infuscatis, immaculatis. Length 3J^ lines, Expanse of wings 7 lines. 



"Inhabiting the province of Valdivia. 



''The dark brown eyes are white pilose, the antennae brown, the frontal 

 protuberance above the same whitish yellow, the light yellow proboscis is hardly 

 half as long as the body. The thorax is brown, clothed with yellowish hair in 

 front and ornamented with pale yellow marks. The prothorax has a yellow 

 margin, the mesothorax is marked with four short yellow stripes above, with two 

 short yellow stripes above the scutellum and a yellow stripe on each side, which 

 commences back of the base of the wing. The scutellum is unmarked above, 

 brown, but the underside is yellowish. The abdomen is very thin, cylindrical, 

 thickened posteriorly; the second segment is as long as wide, smaller posteriorly, 

 the third segment at least IJ^ times as long as broad, the fourth similar, the 

 fifth of the same length, but thickened posteriorly, the sixth segment is small, 

 directed downward, not visible from above. The colour on the dorsum is dark 

 brown, on the side each segment has a yellow spot, becoming broader posteriorly; 

 the fourth and fifth have above in the middle of the posterior margin a small 

 yellow spot, which on the fifth segment coalesces with the (also yellow) hind 

 margin. The venter is yellowish. The wings are infuscated, brownish ^ray, 

 unspotted. 



'"'5. M. trislis Ph. M. corpore nigro, sub-unicolore; thorace minus gibboso, 

 flavo-punctato; abdominis gracilis segmento primo lateribus, tertio in margine 

 postico flavis; pedibus ferrugineis, femoribus atris, basi tibiarum nigricante; 

 alis infuscatis, nubecula centrali obscuriore. Length of body 3^ lines, expanse 

 of wings 6 lines. 



"Taken in my Valdivian estate at San Juan, of wBich I have frequently 

 spoken. 



"The yellow proboscis is about half as long as the body or only a little 



