S. A. Rohwer — Three JVeiv .Fossil Insects. 535 



The head is not longer than the thorax. The malar space is 

 distinct ; the eyes oval. The flagellum is about two and a 

 half times as long as the scape ; the first joint of the flagellum 

 is distinctly longer than the second and the second is a little 

 longer than the third. The legs are rather more robust than 

 usual. The venation is rather weak, and normal, differing from 

 C. (Gonochrysis) densa Cresson only in that the radius rises 

 nearer the middle of the small stigma. The abdomen is as long 

 as the head and thorax combined. The apical teeth cannot be 

 seen, but from the general appearance the insect suggests Gono- 

 chrysis. The ovipositor is exserted, and is rather more robust 

 than usual, length 2*75 mm . In the specimen the sculpture can- 

 not be seen, but it is undoubtedly punctured as in the recent 

 species of to-day. 



Habitat : The Tertiary shales of Florissant, Colorado, at 

 Station 14. The collector is unknown. The type is in the 

 University of Colorado. 



The only other fossil Chrysis from Florissant is C. rohioeri 

 Ckll., which differs from the present species in its much smaller 

 size, and the abdomen is shorter than the head and thorax. 

 Chrysis mortua is in general appearance like the recent species 

 densa Cress, found at Florissant to-day. It is however much 

 larger than any specimen of densa known to me. 



Philanthus saxigenus n. sp. 



Sex doubtful ; length of the head and thorax and first two 

 abdominal segments, 9*5 mm ; length of the anterior wing, 8*Y5 mm . 

 Head about the same width as the thorax; ocelli in a low 

 triangle ; the lateral ocellus about 204/* in diameter. Thorax 

 subquadrate, 4'5 mm long, and at the wings 4*5 mm wide. The 

 head and thorax finely sculptured ; the mesonotum with two 

 slightly converging grooves near the center ; these grooves 

 extend posteriorly to about the hind wings ; a little above the 

 tegulse are two shorter grooves ; the tegulse are rather large. 

 The hind tibiae are short yet not shorter than in some of the 

 recent members of the genus : they are not serrate or spinose 

 in the fossil ; the spurs are shorter than the hind basitarsus ; 

 the four anterior legs are not present in the fossil. The radial 

 cell is normal (attaining the costa without an appendiculation) ; 

 the stigma is of medium size ; third transverse cubitus is 

 strongly bent basally about the middle ; the second recurrent 

 nervure is interstitial with the second transverse cubitus ; the 

 second transverse cubitus is slightly oblique ; the first recurrent 

 nervure joining the second cubital cell about the middle ; the 

 transverse median received by the discoidal cell distinctly 

 beyond the median. Abdomen sessile ; the first segment 

 widening toward the apex ; abdomen beyond the second 



