ART. 13. DESCRIPTiONS OF FOSSIL INSECTS COCKERELL. 13 



be conJBdently placed. The new specimen shows neither punctures 

 nor striae. The general aspect is suggestive of the Clytini, the oblique 

 second band being very much as in the European Clytus {Ana- 

 glyptus) mysticus Linnaeus (specimen from Southwater, Sussex, com- 

 pared). I provisionally transfer the insect to Clytus^ which is at 

 any rate more plausible than Lema. The elytron is not truncate as in 

 Clytus, and the reference can not be more than approximate. The 

 dark apex agrees with Leptura. 



Plesiotypc— Cat. No. 69185, U.S.N.M. 



ARACHNIDA. 



Family LINYPHIIDAE. 



LINYPHIA BYRAMI, new species. 



Plate 1, fig. 8. 



Male. — Length hardly 3 mm., the abdomen very small; color very 

 pale, but femora dark brown, broadly pallid basally ; patellae brown ; 

 tibia broad apically and pallid basally; femora very stout, patellae 

 and tibiae with long spines, as in modern Linyphia. The following 

 measurements are in microns : Length of anterior femur 1,600, width 

 450 ; length of anterior patella plus tibia about 1,520, width of tibia 

 240; length of spine at end of anterior patella 520; spines on outer 

 side of anterior tibia about 320; length of second femur about 1,650; 

 length of fourth patella plus tibia 1,200, the patella with a long spine 

 as on front legs. 



Ho7^izon and locality. — Green River Eocene, head of East Alkali 

 Gulch, about 8 miles south of De Beque, Colorado. (John P. By ram, 

 1922.) 



H olotype.— Csit. No. 69184, U.S.N.M. 



Although this spider fails to exhibit many of the more important 

 diagnostic features, the general appearance, marking of the legs, 

 and spines are so exactly those of Linyphia that the reference to the 

 modern genus appears justified. Petrunkevitch (1922) records four 

 species of Linyphia from the Miocene of Florissant. One species is 

 known from Baltic amber {L. ohlonga Berendt). 



While looking up the literature of fossil spiders, I notice that the 

 living Phidippus fomiosus Peckham, 1883, requires a new name on 

 account of the amber P. fomiosus Berendt, 1854. Peckham's species 

 may be designated P. homaHnus. new name, from a certain re- 

 semblance in the marking of the abdomen to a lobster's claw. So 

 also, Glubiona sencea (Cambridge, 1898). from Mexico, is preoccu- 

 pied by an amber species ; the name may be changed to C. tabascana, 

 new name. 



