124 The University Science Bulletin. 



External genitalia. Female : Last ventral segment differing from that of 

 any other member of the genus in being extremely produced medially, three 

 times as long as the preceding segment, with the usual small apical excision, 

 and the lateral margins sometimes slightly concave. The broad and spiny 

 pygofers are slightly exceeded by the ovipositor. Male: Last ventral segment 

 long, hiding the valve. Plates long and slender, longer than last ventral seg- 

 ment, their sides straight to the somewhat narrowed but rounded apices. 

 Pygofers long, exceeding plates by about the length of the latter, bearing the 

 usual spines. 



Internal male genitalia. Styles stout, apical part nearly of same width 

 throughout and bearing many granulations. Connective as broad apically as 

 basally. CEdagus unhke anything in the genus and very characteristic, the 

 basal processes short and not serrate, the distal process verj' long, the fimbriate 

 opening of the penis extending back from the extreme tip for a considerable 

 distance. In addition a pair of large ventral and lateral lobes is present that 

 completely cover the basal processes, these lobes being serrate along their ven- 

 tral margin. The entire dorsal part of the oedagus is also quite different from 

 the corresponding part in the other species of the genus. 



Distribution. With the exception of a single specimen taken by 

 Coquillett at Los Angeles, Cal., all the other fourteen specimens ex- 

 amined by the writer are from Doctor Ball's collection. These were 

 taken from the following localities: Rifle, Colo.; Pardman, Salt 

 Lake City, Utah; Ravenna, Cabazon, Riverside, and Beamnont, Cal. 



Acinopterus pallidus n. sp. 



(PI. Vlll, fig. 10; pi. IX, fig. 4; pi. XI, fig. 2.) 



Closely related to the preceding species, but slightly smaller and paler. 

 Length, 5.5 to 6 mm. 



Form. Head distinctly narrower than the pronotum. Vertex a little over 

 twice as wide as long, not quite one-third longer at the middle than next the 

 eye, the anterior margin evenly rounded and broadly rounding with the front, 

 the depression back of the apex small. Face very broad, the front fully as 

 broad basally as long, and the gense quite wide. Pronotum over twice as wide 

 as long, anterior margin but slightly more curved than the posterior, lateral 

 and humeral margins about equal, disc with transverse wrinkles. Scutelkun 

 with usual granular surface and transverse impressed line. Tegmina moder- 

 ately long, the apices more rounded than in preceding species, venation dis- 

 tinct but not conspicuous, and with but one or two cross-veins between the 

 first and second anal veins. 



Color. The entire insect, abov^e and below, of a pale greenish-yellow color. 

 Apices of some of the veins along costal margin and at apex margined with 

 black, making the tips of the tegmina appear slightly darkened. The tarsi 

 tend to be brownish. 



External genitalia. Female : Last ventral segment produced medially, bear- 

 ing a shallow median notch apically from which the margins round to the 

 base. Pygofers large, sparsely spined, exceeded by the ovipositor. 



Distribution. Described from four specimens taken by Doctor 

 Ball at Cabazon, Cal. 



