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見 蟲學雜 誌 第 Ä 卷 第四魏 



3. Diaeodes lautus Coq. 



Syrühus lautus Coq. Proc. Nat. Mus. U.S.A. XXI. p. 323 (1898)； 

 Mats. — Thous. Ins. Jap. II. p. 87 (1904). 

 Black ； the front, antennae, face, and cheeks yellow ； in the female the 

 middle of the front brown, prolonged as a narrow line down to the inser- 

 tions of the antennae ； hairs of the front, antennae, and upper part of the 

 face black ； those on remainder of the face, the cheeks and occiput yellow; 

 eyes brownish pubescented. Thorax aeneous black, with 3 deep black 

 stripes, the spaces between them anteriorly grayish pruinose and a spot 

 on the pleura in front of the wings yellowisn-gray pruinose ； hairs of the 

 thorax mixed black and yellow, those at the humerus chiefly yellow; 

 scutellum polished, bluish, its hairs being- black. Abdomen opaque, the 

 first segment and both ends of the 2nd polished bluish, the 3rd and 4th 

 segments each marked on the anterior part with an arcuate yellow fascia, 

 the posterior portion of the 4th and the whole of the 5th segment polish- 

 ed yellow ； hairs of the first 3 segments, the base and sides of the 4th, 

 black, hairs of remainder of the abdomen yellow. Legs yellow, the coxae, 

 trochanter, bases of the femora, black. Wings hyaline yellowish, veins 

 and stigma fulvous. Halteres yellow, calypteres brown. 



Length - ビ^ i6-i8 mm. . 



Hab. -— Honshu, Kiushu ； not common. 



Dideopsis Mats. (n. g.) 

 Differs from Dldeodes Mats, as follows : 



Antennae especially the 3rd joint smaller, the 3rd joint blunt conical, 

 somewhat twice as long as the first and 2nd taken together; the arista 

 situated near the base on its outerside of the back, somewhat longer than 

 the antenna itself. Compound eyes bare, tlie touched portion in the male 

 as long as the vertex, narrow, a little narrower than the half breadth of 

 the front between the antennae ; ocelli small, the anterior ocellus widely- 

 separated from the posterior. Proboscis soniewbat shorter, oral opening 

 oblong, in the middle somewhat narrower. Wing-s ample, the 3rd longi- 

 tudinal vein opens near the apex, distinctly curved into the first posterior 

 cell, the cross-vein at about l4 of the discoidal ceil near the base, the 

 bend of the 4th vein without appendage (only a fold may be seen). 



