ODYNERUS. 135 



2. Odynerus maurus. 



Female. Length 6^ lines. — Entirely black, with dark fuscous wings 

 that have a violet iridescence, and some semifusco-hyaline spots 

 about the second and third submarginal cells. The head and 

 thorax very closely punctured ; the clypeus with stronger punc- 

 tures, its apex truncate, concave, and with the lateral angles sharp 

 and apparently bidentate. The scutellurn flattened ; the postscu- 

 tellum rugose, and with the margin crenulated ; the metathorax 

 truncate, having a central longitudinal channel, on each side of 

 which it is obliquely rugose-striate. The basal segment of the ab- 

 domen obtusely rounded, not ridged, and, as well as the second 

 segment, with very fine distant shallow punctures ; the apical 

 margin of the second segment and the following segments with 

 distant large shallow punctures. 



Male. Smaller, but closely resembles the female ; the hooked joint 

 at the apex of the antennae is ferruginous. 



Hah. Honolulu &c. 



The Kev. T. Blackburn states that this species is apparently common 

 all over the Hawaiian islands, constructing mud nests of 1 to 10 cells 

 against stones, trunks of trees, &c, under eaves of houses, often even 

 inside houses. 



Group of Odynerus vagus, Saussure's American Wasps, p. 314. 



3. Odynerus rubritinctus. 



Female. Length 4| lines. — Black, with the postscutellum, the me- 

 tathorax, the basal segment of the abdomen, and the lateral and 

 apical margins of the second segment dark blood-red. Head with 

 a triangular red spot at the insertion of the antennae above ; the 

 clypeus convex, narrowed anteriorly, its apex truncate, the lateral 

 angles of the truncation subdentate. Thorax with a red spot be- 

 neath the wings and a minute one on the tegulae in front and 

 behind, closely and not very strongly punctured in the same 

 manner as the head ; the scutellurn flat, and with a central longi- 

 tudinal impressed line; the metathorax concave-truncate, the 

 cavity black ; wings dark fuscous, with a violet iridescence ; along 

 the course of the nervures is a more or less hyaline line. Abdomen 

 shining; the first segment campanulate, and with rather strong 

 distant punctures ; the rest of the segments more finely punctured ; 

 the red lateral margins of the second segment are united by the 

 red posterior margin. 



Male. Length 3| lines. — Very closely resembling the female; the 

 terminal hook of the antennae red. Thorax with two ovate spots 

 on the scutellurn, also two beneath wings, frequently united ; the 



