1919] Alexander: Japanese Crane-Flies 343 



Rhaphidolabis Osten Sacken. 



Rhaphidolabis flavibasis sp. n. 



Antennae with fourteen segments, the last segment enlarged; meso- 

 notal praescutmn light gray, with three dark brown stripes; base of the 

 wings strongly yellowish; male hypopygium with the outer angle not 

 produced into a lobe, the appendages borne at the narrow apex. 



Male — Length, 7 mm.; wing, 8.7-8.9 mm. 



Female — Length, 7.5-8 mm.; wing, 9.4-9.8 mm. 



Rostnmi and palpi dark brown. Antennae dark brownish black, 

 the first scapal segment gray pruinose, the second scapal segment a 

 little brighter apically; there are twelve flagellar segments which grad- 

 ually decrease in size to the end of the tenninal, one much larger than 

 the penultimate and seemingly produced by the union of two small 

 segments. Head light brownish gray, clearest along the inner margin 

 of the eye ; an indistinct dark median line ; vertical tubercle low. 



The mesonotal praescutum light gray with three dark bro\vn stripes, 

 the intermediate stripe entire; remainder of the mesonotum plumbeous, 

 gray pruinose. Pleura light gray. Halteres dark brown, the basal 

 third of the stem bright yellow. Legs with the coxas gray; trochanters 

 brown; femora dark brown, brighter on the basal third; tibiae and tarsi 

 dark brownish black. Wings grayish subhy aline, the costal and 

 subcostal cells a little more yellowish; base of the wings bright yellow, 

 including the veins ; stigma distinct, brown ; veins dark brown. Venation : 

 Rs short, slightly arcuated to feebly angulate near midlength; i?2 

 ublique, its fusion with Ri at the wing tip slight; 7^2+3+4 rather short, 

 osually a little longer than r-m; cell Mi present; cell 1st Mi open. 



Abdomen dark brown, sparsely gray pruinose. Male hypopygium 

 with the pleurites short and stout, at the apex with the two small 

 pleural appendages, an outer subcircular fleshy lobe whose inner face 

 is densely set with short black spinous setae; inner pleural appendage 

 more chitinized, slightly curved, along the inner margin with about a 

 dozen spinous setae that are stouter and more crowded near the tip; 

 lateral gonapophyses slender, bent at a right angle near midlength. 

 Ovipositor rusty in color. 



Habitat: Japan. 



Holotype, cf, Meguro, Tokio, March 27, 1919 (R. Taka- 

 hashi) , 



Allotopotype, 9 , April 4, 1919. 



Paratopotypes, 8 d' 9 , March 20-April 9, 1919. 



One teneral female that may represent still another unde- 

 scribed species has cell Rz sessile, the petiole being entirely 

 lacking. The praescutal stripes are less distinct than in the 

 specimens above described. 



