294 [April 



distinct towards the tips; venter very deeply concave. Length 31 

 lines ; expanse of wings 6J lines. 



One specimen. 



:?. Chelonus iridescens. n. sp. 



Black, subsericeous : antennae piceous ; most of legs pale ferruginous : wings 

 fuliginous, the apical margins beautifully iridescent. 



Male. — Black, opaque, subsericeous, sculptured like C. riifiventris, 

 except that the face is not transversely striated ; palpi and antennae 

 piceous, the latter sericeous, longer than the head and thorax ; tegulae 

 also piceous. Wings uniform pale fuliginous, the apical margins, 

 especially of the posterior pair, beautifully iridescent; nervures and 

 stigma black ; the second submarginal cell complete. Legs black, 

 the anterior femora, tibiae and tarsi, apical half of the intermediate 

 femora, their tibiae and tarsi, tips of the posterior femora, their tibiae 

 except base and apex, and the base of their tarsi, pale ferruginous. 

 Abdomen shaped and sculptured similar to C. rujiventris, subserice- 

 ous; venter deeply concave. Length 2 1 , lines; expanse of wings 4 lines. 



One specimen. 



4. Chelonus laevifrons. n. sp. 



Black, subsericeous; most of legs pale ferruginous; wings hyaline, iride- 

 scent; face almost smooth; antennae nearly as long as the body; abdomen 

 above covered with longitudinal striae, 



Male. — Black, opaque, finely rugose, subsericeous; head very finely 

 sculptured, the face almost smooth, and somewhat shining; mandibles 

 and palpi piceous; antennas three-fourths the length of the body, en- 

 tirely piceous. Thorax sculptured similar to the preceding species, but 

 more finely rugose, and the inetathorax has two sharply defined diverg- 

 ing carinas on the dorsal middle; tegulae fuscous. Wings hyaline, very 

 slightly tinged with dusky, beautifully iridescent; nervures pale fus- 

 cous ; second submarginal cell almost closed. Legs blackish, the tibiae 

 and tarsi pale ferruginous, the posterior tibiae dusky at base and apex, 

 as well as the tips of all the tarsi ; most of the anterior femora and the 

 tips of the posterior pair, pale ferruginous. Abdomen oblong-ovate, 

 apex obtuse, but not broadly rounded; upper surface subconvex aud 

 covered with fine irregular longitudinal striae, which become finer and 

 less distinct towards the tip ; venter deeply concave. Length lj line; 

 expanse of wings 3 lines. 



One specimen. Much smaller than C. iridescens, with the antennae 

 longer, the face almost smooth, aud the abdomen more elongate and not 

 so blunt at tip. 



