1919] Hine: Genus Erax 149 



Female unusually robust for an Erax. Abdomen, except the 

 oviduct, uniformly pale yellowish pollinose, oviduct shining black, about 

 as long as abdominal segments five, six and seven combined. Otherwise 

 colored as in the male. 



Several specimens of each sex from, Douglas County, 

 Kansas, 900 feet elevation (F. H. Snow). From Onaga, 

 Kansas, and from Osborne County, Kansas, 1557 feet elevation, 

 collected August 3, 1912, (F. ,X- Williams), Ardmore, Indian 

 Territory, (C. R. Jones) ; Piano, Texas, (Tucker) ; Waco, 

 Texas, (Belfrage), and other localities in Texas. 



A male from Onaga, Kansas, taken August 20, 1901, is like 

 the other males, except that abdominal segment seven is 

 black instead of silver white. This gives the specimen quite a 

 different appearance, but since similar variations have been 

 observed in other species of the genus it is not considered 

 specific here. 



Erax coquillettii n. sp. 



Male. Total length 16 millimeters. Mystax and beard white, 

 ocellar tubercle and posterior orbits above with black bristles, meso- 

 thorax with black hair and bristles. Scutellum with abundance of 

 long white hair on the disc and numerous mostly white bristles on the 

 margin, wings hyaline, furcation of the third vein distinctly anterior 

 to the vein which closes the discal cell, but plainly beyond the middle 

 of the distance between this vein and the anterior cross- vein, stump 

 of the anterior branch much longer than the basal section. Femora 

 black, tibiae yellowish red with the extreme apexes dark, tibi« dark 

 red, legs with white hair and black and white bristles. Abdominal 

 segments one, two and basal part of three black in ground color and 

 only sparsely hairy, apical part of three and all of four and five densely 

 silver- white and white hairy, parted at the middle and directed outward, 

 six and seven silvery with very short hair. Hypopygium from dorsal 

 view narrow on basal third, much widened apically where the width 

 is nearly double that at the base. See Figure 14. 



Female colored like the male. Abdomen shining black, each segment 

 gray pollinose posteriorly, giving a distinct banded effect. Oviduct 

 shining black, about as long as the last four abdominal segments. 



Type male and allotype from San Diego County, California, 

 collected by Coquillett in April. In the United States National 

 Museum. Several other specimens of both sexes with the same 

 data. 



The inflated appearance of the apical half of the male 

 genitalia, the nearly naked first and second abdominal segments 

 which are black in the male, and the banded abdomen of the 

 female suggests the species. 



