ADAMS : NORTH AMERICAN DIPTERA. 447 



but a very short one at angle on posterior side, the fifth vein is 

 continued as a short stump beyond the posterior cross-vein. 

 Length, 6 mm. 



Two specimens ; Congress Junction, Ariz. Collected by 

 Dr. F. H. Snow. 



Nausigaster geminata Towns. 



A female specimen from Oak Creek canyon, Arizona, agrees 

 with Townsend's description, except the spurious vein is nar- 

 rowly bordered with brown, there is a small spot on apex of 

 third vein, the third vein emits a stump on posterior side a lit- 

 tle before the middle of the first posterior cell, the last section 

 of the fourth vein has a stump on posterior side at first angle 

 and one on anterior side at second angle, fifth vein is continued 

 as a stump beyond the hind cross-vein. 



Nausigaster punctulata Will. 



A male specimen from Oak Creek canyon, Arizona, agrees with 

 the description of this species, except the last section of the 

 fourth vein emits a stump near its middle on the anterior side, 

 the fifth vein is slightly infuscated just beyond the posterior 

 basal cross-vein. 



Sphyximorpha snowi, n. sp. 



Female : Head yellow, the front from just above the ocelli 

 to about half-way to antennae, a broad stripe on cheeks, a nar- 

 row line from base of antennal process to mouth, and antennal 

 process light reddish yellow; antennae fuscous, the third joint, 

 except on inner sides at base, black ; mouth-parts fuscous ; 

 occiput at the middle on the sides blackish, covered with whitish 

 pollen ; pile of occiput and vertex white. Thorax red ; humeri, 

 a spot on outer end of suture, a superalar stripe, a large spot 

 on mesopleurcTi extending onto thesternopleuri?e,andpteropleurse, 

 scutellum and hal teres yellow. Abdomen reddish, very little 

 constricted at base, the first segment with a large yellow tri- 

 angle on each anterior angle which reaches to the posterior 

 border, the subtriangular space on dorsum is largely black ; 

 the three following segments with a broad posterior yellow 

 border, the last one of the three being a little over one-half the 

 length of the segment in width. Legs reddish yellow, base of 



2— Bull., No. 14. 



