SOME AMERICAN GEOMETRID MOTHS CAPPS 133 



spined area (cornuti) of the penis being absent and the furca shorter 

 and broader in vitraria than in jacularia. Their conclusions were 

 based on the genitalia of one dissected specimen, a paratype of jacu- 

 laria. The genitalia of the type have the furca longer and slenderer 

 than the paratype, and there is a patch of cornuti on the penis (these 

 are deciduous in every species of the group). Aside from the fact that 

 the specimens and genitalia of jacularia are slightly larger than 

 those of vitraria there are no essential differences. 



The close similarity of jacularia and vitraria, their collection dates 

 (jacularia, Apr., May; vitraria, June, July, Aug.), and their dis- 

 tribution (jacularia, New Mexico; vitraria, Colorado, New Mexico) 

 suggest that they may be earlier and later generations of the same 

 form. Until this is verified by future rearings, it is believed ad- 

 visable to treat them separately and to use the name jacularia for 

 the larger, darker ocherous, rather heavily dusted fuscous, south- 

 western race of athasaria. 



13. LAMBDINA NEGATA (Dyar) 



Plate 3, Figures 9, 9A ; Plate S, Figure 24 

 Therina negata Dyar, Insecutor Inscitiae Menstruus, vol. 6, p. 136, 1918. 



Male. — Dull brownish ocherous, with a slight testaceous tinge; 

 heavily sprinkled with pale fuscous scales; transverse lines evenly 

 curved, obsolete between the veins and chiefly indicated by fuscous 

 dots on the veins, occasionally with faint ocherous borders. 



Alar expanse, 33 mm. 



Genitalia (figs. 9, 9A) similar to those of athasaria, except aedeagus 

 not conspicuously extenuated posteriorly and the distal plate only 

 slightly produced (probably an individual rather than a specific 

 character). 



Female. — Similar to the male in color and markings. 



Alar expanse, 35 mm. 



Genitalia (fig. 24) similar to those of athasaria, but internal band 

 of the ductus bursae not extenuated posteriorly (perhaps an individ- 

 ual rather than specific difference). 



Type.— U.S.N.M. No. 21739. 



Type locality. — Zacualpan, Mexico. 



Food plants. — Unknown. 



Distribution. — Mexico: Orizaba, Zacualpan (Oct.). 



Two specimens examined. 



Remarks. — Closely resembles, and scarcely separable from, the less 

 distinctly marked examples of jacularia. A larger series will be nec- 

 essary to determine the distinctness or synonymy of the two forms; 

 negata may represent only a Mexican race of athasaria. 



