Sept., '04] ENTOMOLOGICAL NEWS. 249 



Psotodesmns doroUiea n. sp. 



Total length J* 70-71, ? 60-61 ; abdomen J* 58-59, $ 48-50 ; hind 

 wing (^ 45-46, 9 43-45 ; width of front wing (^ and $ 12 ; stigma front 

 wing (5* 2.5, $ 2 ; last femur ^ and 9 8 ; tibia and tarsus to end of tarsal 

 claws r^ and 9 10 ; length of longest cilia on legs ^^ and 9 2 -1- mm. 



Head black, postclypeus metallic green, second joint of the antennae 

 pale greenish on the anterior side, longer than the inconspicuous first 

 joint, eyes brown. Thorax and abdomen slender ; thorax metallic green, 

 middorsal carina and lateral sutures verj' narrowly, sides below and pro- 

 thorax, black ; legs black, pale basally especially on the inferior surface, 

 where the pale area extends about half the length of the femora ; cilia 

 numerous and long. 



(^ . Pectus black, a sharply defined pale spot near the posterior border. 

 Wings hyaline with violet and green reflections, apices for a distance of 

 of 5 mm. and stigma dark brown, the colored wing membrane with more 

 brilliant reflections than the hyaline portions of the wings, coppery being 

 most conspicuous ; inner edge of brown area more or less concave ; the 

 dark brown or black of the wing apices extends basally more or less defi- 

 nitely along the anterior portion of the wings in the costal, subcostal and 

 radial spaces, more heavily marked in the front wings where the color 

 may extend quite to the wing base, doubtless variable with age. Ante- 

 nodals front wings 33-37, hind wings 32 ; postnodals front wings 79-81, 

 hind wings 71-75. 



9 • Pectus pale, abdomen dark brown basally, shading posteriorly 

 into black. Wings similar to the male, but with the brown on apices 

 more extensive, 7 to 8 mm. in length, and the brown of the anterior margin 

 less sharply defined ; inner edge of brown apices nearly straight ; stigma 

 chalky white. Abdominal appendages slender, acute, as seen from the 

 side about as long as segment 10 ; the extreme apex bi- or trifurcate. 



Habitat — Formosa ; 3 males and 2 females in my collection, 

 all mature. Dr. Calvert has examined a ^ and a $ and con- 

 firms my opinion as to the distinctness of the species. Named 

 for my mother, Dorothea Kellerman Williamson. 



The single hitherto known species of Psolodesnnis, manda- 

 rinus McLachlan , originally described from a single imperfect 

 % from Amoy (Trans. Ent. Soc. Lond., p. 166, 1870) and 

 later recorded and described from two males from Formosa by 

 Hagen (C. R. Soc, Ent. Belg., xxiii, p. Ixii, 1880), is at 

 once distinguished from dorothea bj- the more extensive black 

 on the wings {matidarinus has the apical fourth blackish 

 brown) and the presence of a broad semi-opaque white band 

 across the wings, no trace of which exists in dorothea. In col- 

 oration of wings matidarinus is described as somewhat suggest- 



