70 



22 (25) Male with the clypeus whitish or yellow; basal abdominal seg- 



ment not extremely coarsely punctured about the base 

 of its dorsal surface in either sex. 



23 (24) Middle tibiae without a calcar; propodeum with the posterior 



concavity only finely rugulose. Af. dilatatipes. 



24 (23) Middle tibiae with a calcar; propodeum with the concavity 



rugose. O. kirbyi. 



25 (22) Male with the clypeus black ; basal abdominal segment in both 



sexes extremely coarsely punctate at base. O. kauaiensis. 



26 (19) Second ventral segment with a distinct depression behind the 



costae. 



27 (28) Basal abdominal segment almost evenly curved from the 



petiole to the hind margin, when seen in profile; being not 

 at all abrupt in front. O. eludens. 



28 (27) Basal abdominal segment abrupt in front, having a distinct 



dorsal and anterior face, though the angle, where they 

 meet, is rounded off. 



29 (30) Second dorsal segment, seen in profile, with the highest point, 



to which it is raised, situated near the middle of the length 

 of the segment. O. homochromus. 



30 (29) Second dorsal segment with the highest point far before the 



middle of its length. 



31 (32) Mesonotum with the minute interstitial puncturation distinct; 



propodeum rugose. O. caenosus. 



32 (31) Mesonotum with the minute interstitial puncturation hardly 



noticeable; propodeum smooth but with shallow punctures. 



O. lencozonias. 



(iv) DESCRIPTION OF SPECIES. 

 Odynerus homoeophanes. 

 Black, with dull, red markings. A median frontal spot and one on 

 the posterior margin of the eyes, a line in the emargination of the latter, 

 markings on the pronotum, mesonotum, scutellum, post-scutellum, 

 mesopleura and sometimes on the propodeum, the posterior margins of 

 from three to five abdominal segments, as well as the clypeus, a line 

 on the scape of the antennae and the front tibiae (more or less) in the 

 male, dull red. Apex of clypeus in the male slightly emarginate, truncate 

 or almost so in the female. Head and face very densely punctured. 

 Mesonotum very densely, rugosely punctate, with discal red lines which 

 are usually connected with those of the posterior three-fourths of the 

 lateral margin; scutellum and post-scutellum very densely punctured, the 

 propodeum rugose. Basal abdominal segment dull, densely punctured, 

 the second also dull and punctured all over though more coarsely and 

 densely towards the apex, the red band dilated at the sides; beneath, the 

 costae are long and well defined and the segment is widely flattened or 

 faintly depressed beyond the apices of the costae. Wings hyaline, not 

 iridescent, infuscate basally and along the costa. Length 9.5-13 mm.* 



* The measurements are taken from the front of the head to the apex 

 of the second abdominal segment. 



