COLLECTED IN BORNEO. ' 107 



hexagonal, about twice longer than broad; veinlet between theSrcl extcrno- 

 medial vein and the subanal near the base of the discal areolet. 



10. LiMNOBiA AEGENTO-ciNCTAj n. s., foem. Nigra, antennis vcrtioillato- 

 pilosis, thorace nitido, abdomme fasciis argeuteis, femoribus subclavatis, 

 alis cinereis venis nigris nebulosis. 



Female. Black. Antennae verticillate-pilose. Thorax shinuig. Abdomen 

 with silvery bands. Femora subclavate. Wings grey ; veins black, shghtly 

 clouded with black. Length of the body 3^ Unes ; of the wings 6 lines. 



Gen. Pterocosmus, Walk. 



Limnohia leucotelus and L. plecioides, p. 6, and other species, may be placed 

 in this genus ; the structure of their wing-veins differs somewhat from that 

 of Meigen's Div. 1. 



11. Pteeocosmtjs LtiNiaEEUS, n. s., mas. Ater, pcdibus piceis, aUs violaceo- 

 nigricantibus apice testaceis macula discaU sublunata alba. 



Male, Deep black. Legs piceous. Wings black, with violet reflections, 

 testaceous at the tips, and with a white sUghtly curved discal white spot. 

 Length of the body 5 hues ; of the wings 8 hues. 



12. Pteeocosmtts ineixits, n. s., mas et foem. Niger, thorace ferrugineo, 

 abdomine antico flavescente, vitta viridi, pedibus ferrugmeis, femoribus 

 tibiisque apice tarsisque nigris, alis violaceo-nigi-icantibus fascia brevi discah 

 maculaque subapicaU albis. Fcem. Abdominis segmentis postcrioribus ni- 

 gris fulvo margmatis, terebra ferrviginea. 



Male and Female. Black. Thorax and legs ferruginous. Abdomen to- 

 wards the base yellowish, and with a green stripe. Tarsi and tips of the 

 femora and of the tibise black. Wings blackish, with violet reflections, 

 adorned with a short white discal band and with a subapical white spot. 



Female. Hinder segments of the abdomen black, with tawny borders ; 

 oviduct ferruguious. Length of the body 5-6 hues ; of the wings 10 lines. 



13. Pteeocosmtjs optabilis, n. s„ mas, Ater, abdomine luteo basi fasciaque 

 lata postica atris, pedibus piceis, ahs nigricantibus apice subcuiereis fascia 

 brevi discah alba. 



Male. Deep black. Abdomen luteous, black at the base, and with a broad 

 black posterior band. Legs piceous, very slender. Wings blackish, with 

 violet reflections, greyish hyahne at the tips, with a hinpid mark by tlie 

 Ulterior angle, and with a short white chscal band. Length of the body 

 3 lines ; of the wings 6 Unes. 



1-4. Pteeocosmus combinatus, n. s., fcem. Saturate rufo-ferrugineus, capita 

 nigro, abdomine fascia antica testacea, terebra pedibusque paHide fiilvis, 

 ahs violaceo-nigricantibus guttis costahbus et marginahbas macula discah 

 lumilaque subapicah albis costa testacea. 



Female. Deep reddish ferruginous. Head and antcnnse black. Abdomen 

 with an anterior testaceous band. Oviduct, legs and halteres pale tawny. 

 Tarsi blackish towards the tips. Wings blaokisli, with violet reflections, 

 with a few marginal wliite dots, with I wo wliite spot s (one discal, the otlicr 



