266 ENTOMOLOGICAL NEWS. [June, '08 



The T-shaped spot on frons is best developed in jalapensis, 

 and of smallest area in multicolor. In multicolor the stem of 

 the T in front is about .66 mm. wide and the sides of the stem 

 are straight or slightly concave, diverging posteriorly and 

 isolating the blue vesicle and the lateral ocelli from the blue 

 area of the frons by a band of black about twice as wide as the 

 ocelli. The ocelli are separated from the blue vesicle by a line 

 of black narrower than the ocelli. In mutata the stem of the 

 T in front is wider than in multicolor but scarcely I mm. wide, 

 but the sides, instead of being concave, are distinctly convex, 

 and the vesicle is less blue, the vesicle and the lateral ocelli 

 more widely separated from the blue area of the frons, and the 

 lateral ocelli separated from the vesicle by a line of black fully 

 as wide as the ocelli. In jalapensis the stem of the T in front 

 is over I mm. wide, the sides straight but more divergent than 

 in the other two species, the lateral ocelli and vesicle isolated 

 from the blue area of the frons by a band of black about three 

 times as wide as the diameter of the ocelli; the extent of blue 

 on the vesicle as in mutata. 



In coloration of abdomen males of mutata and multicolor 

 are almost identical, although the blue spots are slightly re- 

 duced in mutata especially on segment 10; jalapensis has the 

 spots greatly reduced. A similar reduction is true also of the 

 more obscurely colored females. In the matter oi coloration of 

 jalapensis and mutata we have an exactly parallel case in the 

 two species with very similar appendages which have been as- 

 sociated under the name constricta. In this case, as in the case 

 of mutata and jalapensis, the species with the dark-colored 

 abdomen is the slenderer, less robust of thorax. The habits 

 of the two species associated under constricta are well known 

 to me and are entirely distinct; it is probable that mutata and 

 jalapensis show a parallel difference in habits. 



Some venational characters of the three species are tabulated 

 below. These may be summarized briefly, calling attention to 

 mutata and multicolor especially, since in these venational dif- 

 ferences are most constant. 



i. Mutata compared with multicolor has narrower wings 

 with distinctly less curved supplements and a more distal ter- 



