8 FAUNA HAWAIIENSIS 



Sphegidae. 



(i) Pclopceus cae7ftentarms. 



Sphex caementaria, Drury, Exot. Ins. i. p. 105. 



Pelopcejis caemetttarius, Blackburn and Cameron, P. Manch. Soc. xxv. p. 173. 



Hab. Very abundant all over the islands, but not extending to great altitudes 

 on the mountains. An introduced species, common in North America. Preys on 

 Spiders. 



MiMKSIDAE. 



The Hawaiian Mimesidae form two distinct genera, the females of which are 

 very unlike one another, but the males in some cases can only be distinguished by 

 slight characters. In the genus Nesoviimesa the males of the several species are 

 excessively difficult to separate, but the females afford better characters. All the 

 species are remarkable for the feebleness of their thoracic sculpture. The genal 

 spines of the ?, although subject to excessive variation in most species, nevertheless 

 afford useful characters, as also does the condition of the surface of the anterior area 

 of the propodeum, and the colour of the spines of the anterior tarsi. In the genus 

 Deinomiinesa also the females afford the better characters. These are chiefly found 

 in the form of the clypeus, but the carinated pedicel of the basal abdominal segment, 

 although variable in structure in some species, is of considerable assistance in the 

 determination of the species. The Hawaiian species of the family, so far as they 

 have been observed, prey entirely on Tipulidae. They usually burrow in the ground, 

 but have occasionally been seen entering burrows in dead trees. 



Nesominiesa, gen. nov. 



Forma gracili, elongata, capite a fronte transverso. Palpi maxillares longi, pilosi, 

 articulo 2° et 3° fortioribus, 4° elongate lateribus parallelis, 5° forma praecedentis sed 

 longiore, 6° perlongo et gracillimo. Palpi labiales articulo apicali perlongo. Antennae 

 longae, cT evidenter, ? subfortiter clavatae. Tibiae posticae spinis brevibus armatae. 

 Tarsorum articulus apicalis ? in basali parte spinis utrinque fortioribus armatus, ad 

 apicem spinis longis, gracillimis. Abdominis segmenti primi pars petiolata parte apicali 

 evidenter longior. Armatura genitalis </ duabus appendicibus angustis et elongatis 

 apice instructa. Caput ? utrinque spinis genalibus armatum ; area pygidialis triangu- 

 laris, punctata, setis decumbentibus vestita. 



Allied to Miviesa, having a similar neuration. Both sexes have long clavate 

 antennae, but the thickening of the apical joints is more pronounced in the ?. 

 The third joint is much longer than the fourth, which is about equal in length 



