18 



M. MATSUMU1ÏA. 



smooth metallic yellow pilosity, posterior margin of each segment deep 

 yellow. Apical areas of wing covers (teginina) beginning with a sub- 

 lanceolate one, two veins of second apical area being separated at their 

 origin on the angle of first ulnar area, two veins of fourth ulnar area not 

 separated at their origin, arising from common stalk on the basal cell. 

 Costal, basal and ulnar veins olivaceous, anal vein and apical margin 

 dusky, basal membrane beautiful cinnabar red. WingB, in certain 

 angles of reflection, beautiful purplish blue. The rest same as the former 

 species. 



Long. excl. tegm. 26-27 mm. Exp. tegm. 67— (39 mm. 



Var. ? A broad greenish yellow central fascia passes across the 

 pronotum, widened anteriorly to davate form, posteriorly to equilateral 

 triangular form, bordered by a broad transverse greenish yellow fascia at 

 the posterior margin. Greenish yellow deltoid spot on each side of 

 mesonotum large, just like an inverted M, not continued to the cruciform 

 elevation ; the latter being dull yellow and traversed by a central 

 brownish fascia. The coimnon stalk of fourth ulnar vein on the angle 

 of basal cell not so long as in true yezoensis. General surface of the body 

 brownish black, sternum, venter, legs much paler than the typical form. 

 Probably this may be quite a different species, but as I have caught only 

 a single specimen, I could not determine fully. 



This is closely allied to the preceding species, but is much larger in 

 size and differs in its coloration and venation, and can easily be dis- 

 tinguished from it. I found this insect for the first time last summer in 

 Ishiyama in a forest of birch, its presence being betrayed by its voice, 

 which also resembles that of M. radiator. This is not so very rare a 

 species, but being of quite a local occurrence has passed unnoticed 

 through the ten years of my entomological collection in this part of this 

 island. I also heard its voice last year in the deep forest of Jozankei, 

 Abuta, Yamanaka, and Toya during a ramble in the latter part of 

 August. 



