20 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. tjO. 



PERDITA INTERSERTA, new spcciea. 



Female. — Length about or hardly 6 mm. ; head and thorax shining- 

 green, the former bluish-green, the latter yellowish-green; head or- 

 dinary; mandibles (except reddish apex), labrum, clypeus, large su- 

 praclypeal mark (notched above) and lateral marks pale yellow, but 

 no dog-ear marks or yellow on cheeks; lateral marks shaped like a 

 gloved hand with index finger pointed upward ; scape yellow, with a 

 dark apical spot behind; eyes green, blackish at lower end; meso- 

 thorax polished, with thin hair; neck entirel}^ yellow, with a yellow 

 line to the similarly colored tubercles; tegulae hyaline with a yellow 

 spot; wings perfectl}^ clear; stigma well developed, very pale orange, 

 nervures very pale; legs yellow, with the hind tibiae dark brown, 

 and their tarsi brownish ; abdomen light yellow, with four broad 

 dark brown bands, each covering the apex of a segment and the base 

 of the one beyond; venter yellow. 



Los Angeles County, California (Coquillett). 



Type.—C2.i. No. 24897, U.S.N.M. 



No date or plant-record, but it will probably be found on one 

 of the native compositae. In my key it runs to P. rectangulata 

 (^ockerell, differing at once by the shining thorax. It is close to 

 P, townsendi Cockerell, but smaller, with dark hind tibiae and other 

 differences. It is even closer to P. stottleri Cockerell. differing by 

 the entirely yellow neck, mainly yellow first abdominal segment, etc. 



PEKDITA EXCLAMANS Cockerell. 



Male. — San Diego County, California, April (Coquillett). It dif- 

 fers a little from New Mexico specimens, having the yellow on pleura 

 divided into two areas, and the fourth broad yellow band on abdo- 

 men interrupted. Possibly a distinct race is indicated. 



PERDITA QUADRAKGULARIS Cockerell. 



il/a?e.— Sanderson, Texas, May 9, 1912 (J. S. Mitchell). De- 

 scribed from New Mexico. 



I 



