88 PROCEEDINGS OF THE NATIONAL IVIUSEUM vol. ii6 



Pentaneura {Pentaneura) fluminalis, new species 



Figures la,h 



Pentaneura carnea (Fabricius) Johannsen, Journ. New York Ent. Soc, vol. 54, 

 p. 279, 280, 1946. Misidentification? 



Holotype male: In USNM 65503, Mad River Beach, Humboldt 

 Co., Aug. 12, 1948, Coll. No. 104, reared, W. 



Head reddish-brown, mouthparts and antennae darkened. Eyes 

 with thin dorsal extension. Antenna! ratio 1.84. 



Thorax yellowish to reddish-brown. Anterior portion of lateral 

 vittae darkest reddish-brown; pollinose, especially on dorsomedial and 

 dorsolateral bristle rows and on prescutellar area. Supra-alar 

 bristles 2; prealar bristles 12; dorsomedial bristles in single staggered 

 row, becoming 2 rows posterior to tubercle at anterior edge of pre- 

 scutellar area. Dorsolateral bristles in single staggered row, becoming 

 doubled at edge of prescutellar area and extending back to scutellum. 

 Dorsomedial and dorsolateral bristles erect, divergent, yellow. 

 Scutellar bristles numerous; anterior ones strewn; 4 posterior erect 

 bristles. Halteres white. 



Fore leg proportions 60:80:60:34:24:15:8. Fore leg ratio 0.75. 

 Fore leg with beard 7 times as long as diameter of tarsus; legs uniformly 

 stramineous. Seven spines in comb on hind tibia; spurs sinuate, 

 ratio 58:24 Qong spur subsequently broken off at tip); side bristles 

 not clearly discernible for counting on short spur; on long spur, 3 on 

 one side only. Middle leg ratio 0.72; hind leg ratio 0.63. 



Wings very heavily haired; R2+3 scarcely discernible. R4+5 only 

 sUghtly proximal to termination of M, very far distal to Cui. Ri 

 distal to Cu2; anal lobe rounded. Wing length 2.89 mm.; venarum 

 ratio 0.85. Ratio of arculus to m-cu:m-cu to wing tip 0.43. 



Abdomen yellowish-brown with reddish-brown fascia on basal part 

 of each segment, faint on segment I becoming progressively wider 

 and heavier until segment VI is almost entirely dark. 



Allot3T)e: In USNM, reared with holotype. 



Wing length 2.70 mm.; fore leg ratio 0.77; middle leg ratio 0.68; 

 hind leg ratio 0.64 ; venarum ratio 0.90 ; ratio of arculus to m-cu :m-cu 

 to wing tip 0.36. 



Paratype: In USNM: 1 female, reared wdth the holotype and 

 allotype. 



Wing length 2.66 mm.; fore leg ratio 0.74; middle leg ratio 0.67; 

 hind leg ratio 0.65 ; venarum ratio 0.85 ; ratio of arculus to m-cu : m-cu 

 to wing tip 0.37. 



This species belongs to Edwards' Group C of Pentaneura. It 

 further belongs to that portion of the group that was not named 

 when Fittkau (1957) erected Thienemannimyia. 



In Johannsen (1946) P j^wminaZis, new species, keys in Group C to 

 P. carnea (Fabricius) and may well be the species that Johannsen 



