1 6 FAUNA HAWAIIENSIS 



fine and dense ; third segment beneath slightly, fourth more distinctly, fifth and sixth 

 strongly depressed. 



Female with the mandibles in front (except at the apex), the front of the scape 

 of the antennae, a fascia at the base of the second segment of the abdomen (often 

 widely interrupted, or reduced to two round lateral spots), sometimes a spot on 

 either side of the third and fourth segments, and a complete band on the fifth, 

 yellowish-white. In one example a small round spot on either side of the second 

 segment is the only abdominal marking. Sculpture very much as in the c/', the 

 puncturation of the thorax generally rather more distinct, the mesothorax posteriorly 

 and the front of the scutellum more or less shining, but variable in this respect. 

 Abdomen generally rather stouter than that of the </ ; sixth dorsal segment distinctly 

 punctured, the surface shining ; second segment beneath hardly shining, finely and 

 remotely punctured, except on the circular lateral pubescent spots, where the punctura- 

 tion is fine and very dense ; the following segments with an apical row of punctures, 

 otherwise impunctate ; apical ventral segment subcarinated, and closely punctured on 

 either side. Posterior tibiae with pale spines. Wings subhyaline in both sexes. 



Hab. Mountains of Kauai (3000 — 4000 ft). Mountains of Oahu, both ranges. 



Obs. The Oahuan examples agree with those from Kauai in structure, but 

 show a stronger tendency to a decrease in size or obliteration of the pale markings 

 on the abdomen. 



(2) Crabro (Solenius) molokaiensis, sp. nov. 



Niger, ^ antennarum articulo sexto fortiter dentato, ? articulo primo antice 

 cum mandibulis flavis. Clypeus argenteo-pilosus. Abdomen nigrum. </ ? . Long. 

 6"5 — 10 mm. 



Allied to the preceding species, the i entirely black, except the front tibiae which 

 are testaceous inwardly, the ? with the mandibles (except at the apex) and the scape of 

 the antennae in front yellowish-white. Clypeus with silvery pubescence in both sexes. 

 Male with the fifth joint of the flagellum of the antennae strongly produced at the apex 

 into a prominent tooth. Vertex of head in the mesothorax with obscure subobsolete 

 puncturation, the scutellum, more or less, slightly shining. Abdomen beneath dull, the 

 second segment with fine punctures, the lateral pubescent spots very finely and densely 

 punctured ; fourth and following segments deeply concave. Female with the meso- 

 thorax much more distinctly punctured than that of the d", dull in front but more or 

 less polished behind, where the puncturation is less shallow and more distinct; scutellum 

 entirely shining, not depressed in the middle, distinctly punctured : propodeum dull, 

 rugulose, with very short longitudinal rugosity in front. Abdomen with the pygidial 

 area of the sixth segment shining, distinctly punctured, its sides raised ; second 



