142 NATHAN BANKS. 



genera are very well separated, but Leucochrysa is very close to the 

 nigricomis section of Chrysopa. These six genera may be separated 

 by the following table : 



1. Third cubital cell divided longitudinally into two sub-equal parts 2. 



Third cubital cell divided obliquely into two very unequal parts 3. 



2. Veinlets on outer and posterior margins of wings forked ; color green. 



Allochrysa. 

 Veinlets on outer and posterior margins of wings mostly simple ; color dark. 



Nothochrysa. 



3. Gradate series in fore wings of but three or four veinlets; in hind wings but 



one series of gradate veinlets Eremochrysa. 



Gradate series of fore wings of more than four veinlets, rarely with but one 

 series in hind wings 4. 



4. Basal joints of antennae widely separated and rather slender; in male with a 



horn between them Meleom a. 



Basal joints of antennas quite close together; no horn in male. 5. 



5. Antenna? much longer than wings; pterostigma with a brown dot. 



Leucochrysa. 



Antennae shorter, or but little longer than wings; pterostigma without brown 



dot. Chrysopa. 



NOTHOCHRYSA McLach. 

 Similar to Chrysopa; the third cubital cell divided subequally as 

 in Allochrysa, but differing from both of these genera in having the 

 veinlets on the posterior and outer margins of wings not forked. 

 The third cubital cell has but one branch to the hind margin, while 

 in all our other genera there are normally two. The uniform dark 

 venation and the generally dark color also distinguish this genus 

 from all our other species. Type N. fulviceps. 



Nolhochrysacaliforuica Banks. — Head yellowish ; antennal bases sur- 

 rounded with black which extends upward on vertex in three lines, one each side 

 near the eye, and one median, enlarged at tip on top of vertex. Antenna- wholly 

 black. Pronotum dark brown, with a paler median stripe, and the sides narrowly 

 yellow. Rest of thorax and the abdomen dark brown, the latter marked with 

 yellow near the tip. Legs brownish, the tibiae rather pale. Wings with wholly 

 brown venation ; pterostigma brown and very distinct; quite close to tip of wing. 

 Antennae rather short. Pronotum longer than broad, tapering in front. Abdo- 

 men quite large, especially at the tip. Wings broad, both pairs rounded at tips; 

 only very few of the veinlets on outer and posterior margins of wings forked, and 

 these only slightly. Length 14 mm. 



The type is from Southern California. There is a specimen in 

 the National Museum from the same State. It is one of the most 

 remarkable and striking forms in the family as represented in this 

 country. 



