528 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



V Falemholus fiorigerus. — A wonderfully preserved specimen (^"0. 405) 

 in which everything but the legs and palpi are visible, the parts of the 

 proboscis being separated, was found in the shales of Florissant by 

 Mrs. Hill. The entire body is very dark-colored, with black hairs ; a 

 minute tuft of spreading hairs is found at the middle of the upper base 

 of the proboscis. The posterior flanks of the thorax are fringed with 

 hairs, and broad open tufts adorn the sides of the 2d-4th and the mid- 

 dle of the i)Osterior border of the Gth-7th abdominal segments, while 

 the entire posterior border of the 4th-8th and the whole dorsal surface 

 of the 9th segment are similarly adorned. Wings hyaline, immaculate, 

 the anterior border straight until near the extremity, where it is strongly 

 and regularly curved ; posterior border gently convex, and at the mid- 

 dle bent, the apex rounded, placed below the middle of the wing and 

 somewhat pointed. The second longitudinal vein takes its rise from the 

 first before the middle of the wing, runs nearly parallel to it through- 

 out its course, most distant from it in the middle. The third longitudi- 

 nal vein originates from the second close to its origin, and still before 

 the middle of the wing, and runs toward the middle of the outer half 

 of the posterior border, half-way to which it strikes the small transverse 

 vein, there turns toward the apex and soon forks, both branches run- 

 ning longitudinally. The fourth longitudinal vein arises from the fifth 

 before the middle of the basal half of the wing, is almost immediately 

 united, by an oblique vein running upward and outward, with the first 

 longitudinal vein, and then continues in an arcuate course, not far distant 

 from the veins on the other side of the first basal cell, to the small 

 transverse vein; here, by a slight angle, it assumes nearly the course 

 of this and the base of the third longitudinal vein, until it runs into 

 the anterior intercalary vein, when it suddenly turns outward, and 

 extends to the tip of the wing, parallel to the posterior border, a slight 

 bend upward at its apex preventing it from striking the very tip of the 

 wing 5 both the small or middle and the posterior transverse veins are 

 exceedingly brief. The fifth longitudinal vein has a nearly direct 

 course from the base to the middle of the outer half of the posterior 



■■ border, but is twice bent; once at its extreme tip, where its apex forms 

 part of the oblique adventitious vein, and is connected by the posterior 

 transverse with the anterior intercalary vein ; and again doubly, some 

 way beyond its middle, where just beyond the tip of the sixth longitu- 

 dinal vein it is united to the posterior border by the posterior basal 

 transverse vein ; here it bends forward nearly at right angles to meet 

 the anterior intercalary vein, and almost immediately bends as suddenly 

 to resume, by a slight curve, its original direction. The anterior inter- 

 calary vein, which plays so extraordinary a part in this family, origi- 

 nates from the lower edge of the fourth longitudinal, half-way from its 

 origin to the small transverse vein, and runs parallel to and just outside 

 of the posterior basal transverse vein, until it strikes the upturned 

 bend of the fifth longitudinal vein, curving at the same time downward 



