102 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



Key to Species of Pentaneura {Pentaneura) Group E of Edwards 



Based on key given by Johannsen (1946) 



1. Small species; body length 1 mm.; wing length 1 mm.; body brownish with 



pale halteres and legs P. fimbriata (Walker) 



Larger species; wing length 1.40 mm. or greater 2 



2. Thorax light brown with greenish pruinescence; abdomen yellow with brown 



fasciae; basistyle yellow; halteres yellow with black knob; tibiae yellow 



with narrow dark apices. Length 2.5 to 3 mm. . . . P. brooksi (Gerry) 



Thorax without greenish pruinescence, or otherwise differing 3 



3. Basitarsus of middle legs longer (1.1) than corresponding tibia; tliorax 



yellow, vittae brown; abdomen yellow with brown basal fasciae. 



P. pilosella (Loew) 

 Mesothoracic leg ratio less than 1.0 4 



4. Antennal ratio about 0.5; fore leg ratio about 0.75; yellow species with 



buff-colored thoracic vittae P. flaveola (Williston) Johannsen 



Antennal ratio 1.0 or greater 5 



5. Cross veins darkened; arculus to m-cu:m-cu to wing tip about 0.5; R4+5 



terminates noticeably distal to Cuj; thorax pale with buff yellow vittae; 



abdomen yellow with brownish fasciae .... P. planensis Johannsen 



Cross veins not darker than adjacent veins; arculus to m-cu:m-cu to wing tip 



0.45 or less 6 



6. Cross vein m-cu lies proximad of base of Rs by distance less than length 



of m-cu; thorax reddish-yellow with dark brown vittae; abdomen fas- 

 ciate; antennal ratio 1.33; middle leg ratio 0.88; arculus to m-cu:m-cu to 



wing tip 0.43; wing length 1.7 mm P. indecisa (Williston) 



Distance between m-cu and Rs greater than length of m-cu 7 



7. Fore tarsi with long beard (hairs 5 to 8 times diameter of tarsus); thoracic 



markings dark brown; fore leg ratio 0.78-0.86; middle leg ratio 0.55-0.60; 



antennal ratio 1.52 P. comosa, new species 



Fore tarsi with short beard (about 4 times) or bare 8 



8. Basistyle of male genitalia subovate (fig. 2e) . . P. inyoensis, new specie 

 Basistyle of male genitalia subcylindrical, elongate 9 



9. Ninth tergite with conspicuous row of posteriorly directed bristles ... 10 

 Ninth tergite with only fine hairs 11 



10. Fore tarsi with short beard 4.4 times tarsal diameter; thorax marked with 



brown; each abdominal segment blotched with black speckled brown; 



irregular white patch on each side P. thryptica, new species 



Fore tarsi with hairs only shghtly longer than tarsal diameter; thorax 

 marked with reddish-brown; basal one-third to one-half of each abdominal 

 segment with blotchy black fascia, remainder of segment pale. 



P. lyra, new species 



11. Thoracic markings reddish-brown; dorsolateral bristles mostly in 2 rows; 



some multiserial just anterior to scutellum; middle leg ratio 0.71-0.75; 

 hind leg ratio 0.66; basistyle of male genitalia with prominent basal 



diagonal fold P. smithae, new species 



Thoracic markings pale brown; dorsolateral bristles in single staggered row; 

 middle leg ratio 0.80; hind leg ratio 0.75; basitarsus without prominent 

 fold, only slightly wrinkled P. sequoiaensis, new species 



The groups of Pentaneura used by Edwards (1929) and followed by 

 Johannsen (1946) appear to be at least subgenerically distinct. 

 Freeman (1955) has split off Group A as Pentaneura subgenus 



