the; mycetophiIvId^ of north America. 221 



elongate; femora somewhat thickened distally; tibiae with 

 small spurs ; metatarsi lengthened, claws small, pulvilli and 

 empodium distinct. Wings large and broad ; Sci long, extend- 

 ing beyond the middle of the wing; R2+3 shorter than the dis- 

 tance of its base from the R-M crossvein, the media rises at 

 the base of the wing, the fork of the cubitus and the M-Cu 

 crossvein equidistant frcm the base of the wing and far prox- 

 imad of the R-M crossvein (fig. 74). 



Hespcrirms hrevifrons Walker. 



1848. brcvifrons Walker. List. Dipt. Brit. Mus. I. 81. 



Female. Length 6 mm. Wholly fuscous, legs, halteres, and 

 center of tergum of each abdominal segment paler than thorax. 

 Front broad, with 3 large ocelli arranged in a triangle, the 

 middle ocellus most cephalad; palpi 4 jointed, the first and 

 second but little longer than broad, the third more slender, 

 about 4 times as long as broad, the fourth slightly longer than 

 the third, each joint with 10 to 15 stout black setae as well as 

 with very minute setulse which are arranged in transverse rows ; 

 antennae 12 jointed, the first and second broader than long, the 

 third about 3 times as long as broad, the remaining 9 joints 

 about as broad as long and only slightly diminishing in size 

 apically, with few short setae. Antannae if bent back would 

 scarcely reach scutellum. Thorax with indications of 3 broad 

 cinereous stripes, almost bare. Abdomen with 9 visible seg- 

 ments, nearly bare, ovipositor with 2 slender oval lamellae. 

 Legs long but rather stout, tibial spurs very short, inconspic- 

 uous and depressed. Fore metatarsus about .4 the length of 

 the tibia, tarsal claws apparently simple, empodium pad-like, 

 pulvilli conspicuous. Wings cinereous hyaline, veins pale fus- 

 cous, except M-Cu crossvein which is paler, stigma faintly 

 indicated; venation as figured (fig. 74); subcostal crossvein 

 present, anal vein slender, rather faint but prolonged to the 

 wing margin. Length of wing 6 mm. which is 2 2-3 times the 

 fore tibia in length. Mt. Greylock, Mass. June. C. W. John- 

 son, collector. The species has been recorded from Alaska, 

 Canada, Colorado, and White Mountains, New Hampshire. 



The specimen in the LT. S. National Museum determined as 

 this species as I recollect seeing it, is the same as the one 



