Pomona Collegk Journal of Entomology 



493 



Thorax arched. Pronotura terminating laterally in a distinct knob-like enlarge- 

 ment (lateral tubercle of pronotum) ; propleurites exceedingly short, nearly 

 square, rather depressed. Dorsulum variable in lengtii, usually shorter than 

 scutum. JVings broadly rounded at apex, hyaline, maculate, fumate, or spotted; 

 vein furcation distinctly dichotomous ; pterostigma wanting. 



Anal valve of male with a long acute posterior lobe usually reaching to tip of 

 genital plate, and often with an inferior (■])iphysis ; claspers broadly spatulate to 

 subspatulate at tip. 



Type of genus: Aphalara calthae I.inne (1760). 



It has been necessary to reassign the diagnostic lines of this genus because of 

 the artificiality of the pi-cviously accepted lines. After long and careful study of 

 large series of species and specimens, it seems beyond question that the character 



Figure 159. Details of Psyllidae 

 A, Carsidara concolor; B, C. mexicana; C, Rhinopsylla jalapensis; D, Epicarsa 

 corniculata; E, Triozoida johnsonii: F, G, Aphalara calthae: H, Aph. communis; I, 

 Aph. minutissima; L, Aph. caltha; niaculipennis; JM, Aph. artemisiae angvistipennis; 

 N, Aph. pulchella; O, Aph. picta; P, Aph. nebulosa; R, Aph. nebulosa americana; 

 S, Aph. calthre. 



