229 



Mesonotum very dull with surface roughened, subobsoletely and shal- 

 lowly punctate and clothed in lateral view with extremely short erect 

 pubescence. Scutellum extremely dull, almost flat, obsoletely punc- 

 tate, having together with post-scutellum (the anterior margin of which 

 is somewhat shining) a longitudinal impressed line through the middle. 

 Propodeum dull, reticulately rugose excepting the posterior concavity 

 which is almost smooth and very obscurely punctate. Abdomen more 

 shining than the head and thorax; the basal segment subvertical in 

 front, with shallow, large and irregular punctures anteriorly, and 

 smaller and deeper posteriorly; the second segment dorsally, slightly 

 more than convex, evenly and somewhat closely punctate; ventrally, 

 similarly punctate except at the base, with the costae always distinct 

 but variable in development and the segment behind these not at all 

 raised, the depression being but very slightly indicated. *Length, 

 6-9 mm. 



2 Superficially the female is unlike the $ , the structural differ- 

 ences being as follows: Head with the face in front between the eyes 

 very much wider. Clypeus truncate. Thorax extremely dull and 

 smooth with the anterior portion of the mesonotum distinctly, evenly 

 but not deeply punctate; posteriorly the surface of the mesonotum is 

 either impunctate or the punctures are scattered. Scutellum flat, very 

 sparsely and obscurely punctate. Propodeum dull, less reticulately 

 rugose, posterior concavity being slightly more roughened. Second 

 ventral segment of the abdomen has the costae longer and better 

 developed whilst in certain lights there are signs of a narrowly de- 

 fined depression. Length, 10 mm. 



HAB. Kau, Hawaii, 2,000 feet elevation. Described from 

 47 S $ and 2$ 9 taken December, 1911, (Giffard), February, 

 May and July, 1912, (Giffard and Fullaway). Both types 

 are in the author's collection. The species is fomid in localities 

 on the a-a flows flying- in company with 0. peles P., 0. sroria- 

 ceiis P., 0. sociahiUs P., 0. ruhropustulatus P., Nesodynerus 

 egens P., Pseudopterochilus pterocheiloldes P. and Cholody- 

 nerus chelifer P. 



I have named this species out of compliment to Dr. P. C. 

 L, Perkins to whom the collectors of Hawaiian Odynerus are 

 much indebted for his comprehensive tables of all the species 

 described in Fauna Hawaiiensis. 



Odynerus l-oolauensis sp. nov. 

 ^ Black, shining with erect but short gray pubescence; rarely 

 with the apical margin of the first abdominal segment faintly and 

 narrowly yellow. Mandibles black, the extreme apex piceous. Wings 



*The measurements are taken from the vertex of the head to the 

 apical margin of the second abdominal segment. 



