292 BULLETIN UNITEP STATES GEOLOGICAL SURVEY. 



Dr. Gerstaecker (Entom. Ber., 1865, 99 and 113) identifies Clavator 

 with Sypenetes Loew, established for a species from Caffraria; unfor- 

 tunately, he does say on what grounds this identification is based. Dr. 

 Schiner (Die Wiedemann'schen Asiliden and Novara) reproduces this 

 synonymy, without any remark. Now if Clavator punctipennis has, like 

 my Oalifornian species, spurs at the end of the front tibiae, it cannot be 

 the same thing as Hypenetes, which has no such spurs. An attentive 

 scrutiny of Dr. Loew's description discloses other characters which I do 

 not find in my specimen, but which it would be superfluous to discuss 

 here. 



Head not unlike that of Cyrtopogon, but much smaller and narrower ; 

 mouth comparatively much larger and broader, cut obliquely, so that 

 in the profile the head below the face appears retreating ; face short, 

 excised, in the profile, under the antennae, the gibbosity beginning im- 

 mediately below ; the mystax occupies the center of the gibbosity, with- 

 out reaching the eyes or the antennae ; the front is not perceptibly 

 broader above. 



Antenna. — First joint subcylindrical, short; the second still shorter; 

 the third somewhat longer than the two first taken together, attenuated 

 at the base for about one-quarter of its length and then expanded to three 

 times the breadth of its narrow portion, then attenuating again toward 

 the tip (the shape of the third joint holds the middle between the fig- 

 ures 1 and 2 on page 699 of Philippi) ; at the end, a minute cylindrical 

 style, ending in a microscopic bristle. 



Proboscis a little shorter than the vertical height of the head, directed 

 downward ; palpi rather long. 



Thoracic dorsum on each side of the central stripe with a longitudi- 

 nal row of long, stiff, erect bristles; there are seven or eight in each 

 row; a number of similar bristles ou the sides of the dorsum. I per- 

 ceive two on the antescuteliar tubercle, two others in front of these, 

 and again two (sometimes three) above the root of the wing, in front 

 of the suture; scutellum with six similar bristles. 



Abdomen subcylindrical, narrow, somewhat broader at the base ; male 

 hypopygium not stouter than the abdomen ; female ovipositor with a 

 star of short spines. 



Legs rather strong ; tibiae and tarsi spinous ; front and middle femora 

 with a single spine on the hind side a short distance before the tip ; 

 front tibiae with an S-shaped spur at the tip ; ungues long ; pulvilli also. 



Wings like those of Cyrtopogon ; anal cell very little open, sometimes 

 closed; small cross- vein about the middle of the discal cell; second 

 submarginal cell considerably longer than the second posterior ; all 

 posterior cells open ; fourth posterior slightly coarctate. (Compare Dr. 

 Philippi's above quoted figure.) 



Clavator sabulonum n. sp., <?9. — Yellowish-gray; thorax with a 

 geminate blackish stripe; abdomen with a longitudinal row of blackish 

 spots; wings hyaline. Length 7-7.5 mm . 





