498 Pomona College Journal of Entomology 



Head not dcflexcd, with eyes almost as broad as thorax; profile triangular. Oc- 

 cipital margin arcuate ; vertex almost plane, punctate, with a slight imjircssion 

 posteriorly on each side of median suture; anterior margin emarginate broadly 

 at median suture and less so over each antennal insertion. Facial cones entirely 

 wanting. Anterior ocellus somewhat stalked, under projecting vertex, not visible 

 from above. Gena- somewhat swollen. Labrum moderately large, posterior, sub- 

 globose from in front, ovoid from side, slightly pubescent. Antennse short, scarcely 

 longer than width of vertex with eyes ; two basal segments large. 



Thorax large, broad, coarsely punctate, not strongly arched. Pronotum long, 

 from one to two-thirds times the length of dorsulum ; flat on dorsal surface ; extend- 

 ing down on both sides to central axis of eye ; j)roi)leurites short, depressed ; fore- 

 coxae rather small. Dorsulum short, broad, almost as long as scutum. Wings 

 rather small, covered with large, roundish brown dots over entire surface; sides 

 subparallel ; more than two and two-thirds times as long as broad, broadest across 

 first marginal cell, broadly rounded apically; pterostigma wanting; marginal cells 

 variable in size ; second furcal varying from one-half to three-sevenths the length 

 of radius ; fourth furcal one-half to three-sevenths the length of second cubital, 

 terminating at or near tip of wing. 



Male — Genital segment moderately large, claspers long, laterally arched, not 

 tapering to apex, slightly spatulate ; anal valve almost as long vertically as clasp- 

 ers, with a very long, slender, posteriorly projecting lobe on each side, extending 

 to tip of genital segment; pubescence sparse. 



Female — Genital segment very long, fully as long as rest of abdomen; dorsal 

 plate longer and less acute than ventral ; genital pore less than one-fourth the 

 length of dorsal plate. 



Redescribed from one male from Pcrnitz, Austria, determined by Franz Low, 

 and from several males and females from Colorado in the C. F. Baker collection. 

 This species in the United States was named in manuscript Aphalara utahensis 

 by Riley. Four English specimens in the collection determined b}' James Edwards 

 as Aph. artemisiae Forst., belong to another species entirely. 



The male specimen on which this description is largely based is at one extreme 

 of a large series of variations within the species. The numerous specimens in the 

 collection form a continuous series, from the small and whitish body and whitish 

 wings to forms with much larger and greenish yellow body and yellowish white 

 wings ; the dotting and spotting of the forewing, also, is widely but gradually 

 variable from sparsity to great density and running together of dots, often to 

 form maculae. This fact makes the smaller and more sparsely dotted wings ap- 

 pear to the naked eye as almost white, whereas those that are most densely dotted 

 appear yellowish and occasionally light brown. By transmitted light, however, 

 the undotted membrane is always white and corrugated. The structural charac- 

 ters are quite constant throughout the species, with the possible exception of the 

 minor details of wing venation. Although there exists a continuous series as de- 

 scribed above, still it seems advisable to separate those most darklj' spotted into a 

 more or less distinct variety. Riley, from the material at his disposal, recognized 

 two distinct species, apparently not having a complete series. His manuscript 

 name for the larger and darkly spotted forms was Aph. angustipennis. 



