1863.] 
229 
equally robust with the bounding veins.—As the color of the wing- 
veins which lie outside the region of the basal spot is not a sexual 
character, (^Monogr. p. 87,) and as in this 9 the median vein and prin¬ 
cipal sector are pale beneath outside the basal spot, while in % ameri- 
cmia and basalts they are black, it can scarcely belong to either of 
these two species. The yellow line on the orbit of the eye, the irregu¬ 
larity of the pterostigma, and especially the narrowness of the wings 
and the comparatively small number of the ranks of postcostal areolets, 
forbid its being confounded with 9 pseudamericana. Unless therefore 
it is referable to texana^ the pterostigma of which is irregular also, 
though in a different way, it must be an undescribed species. The 
abdomen is lost except the first joint which has a yellowish dorsal 
line, but the legs prove that it belongs to the same subgroup as ameri- 
cana. In texana S there is no short yellow line on the anterior orbit 
of the eye, as in our 9 , but this is described as a sexual peculiarity 
of 9 americana by Say. The front wing, however, of % texana is 31 
millimetres long and 6 millimetres wide at the nodus, and in most de¬ 
scribed Hetserina the 9 wings are either of the same proportional width 
as % wings, or, as in simplex^ auripennis^ hehe^ longipes^ proxima and 
vulnerata from Jg to nearly i wider. But, according to the measure¬ 
ments of the MonograpJiie, the 9 wings are proportionally narrower than 
the % wings, in moribunda by jg, in cruentata by i, and in tricolor 
by Supposing this doubtful 9 to be identical with texana^ the 9 
wings would be nearly l narrower in proportion than % wings. The 
postoccipital tubercles agree with those of texana % , but, unless my 
memory fails me, this doubtful 9 was labelled “ Pennsylvania,’^ not 
Texas, by Mr. Uhler. It only differs from 9 pseudamericana^ besides 
the points already mentioned, in the epistoma being narrowly bordered 
in front, as well as widely at the sides, with whitish, in there being no 
transversely double whitish spot on the prothorax, and in the thorax and 
legs being more dominantly whitish. Antennae except the two basal 
joints, both the anterior legs and abdominal joints 2 —10 lost.* The 
Monographie (pp. 87, 109, 114, &c.) remarks on the great difficulty 
of correlating % with 9 iii llie subgenera Lais and Hetaerina. Hence 
it is very important that when % 9 are taken in coitu they should be 
carefully preserved. Antecubitals 18. Postcubitals 21—22. Cross- 
veins of 4 median areas 4-“6 ] of 4 quadrilaterals 5— 6 . 
* Respecting this doubtful 9 > see Appendix. 
