326 Annals Entomological Society of America [Vol. V, 
species not only in size but in coloration. He describes several speci- 
mens showing a gradation in variation from yellow markings on the 
clypeus, pronotum, mesopleura, scutellum, postscutellum, first, second, 
third, fourth and last abdominal segments to two specimens which had 
no yellow at all. He says the most common form is the one with the 
maximum yellow upon it and that the male examples do not show much 
variation. They have either two yellow marks on the first and second 
abdominal segments or two on the second segment only. 
The specimens that the writer has personally examined agree quite 
well with Burmeister’s typical description except that the yellow 
markings on the fourth abdominal segment would hardly be regarded 
as being on the under side of the segment though well down on the side. 
At the point where the second segment of the abdomen bends abruptly 
upward to meet the first ventral segment and on either side of the mid- 
line of the body are two bluntly rounded tubercles quite large in some 
specimens especially in the males, smaller and almost disappearing 
in the females. 
Between this species and azteca the writer has been able to 
find no structural difference and it is his opinion that the two 
forms can be separated only by the color, azteca being entirely 
black and guttata as described above. This color distinction 
has been easily drawn in all the specimens observed and so the 
writer has chosen to consider the above as two forms, with 
azteca a subspecies of guttata. This causes the name Scolia 
guttata to be changed to Scolia guttata gutiata and Scola 
azteca to Scolia guttata azteca. 
Saussure and Sichel have recorded this species from Mexico. 
The specimens that the writer has seen came from the 
plains of Mexico and from the southern part of Texas. 
Scolia guttata azteca Sauss. 
Scolia azteca SAauss., Rev. et Mag. Zool, (2), (IX), 1857, p. 281. 
Location of the type unknown to the writer. 
Saussure records the length of the species as 27 mm. The length 
of the specimens that the writer has had the opportunity to examine 
varies in the female from 18 mm. to 29 mm. The males measure 
about 20 mm. 
The color of this species is deep black. The wings are uniformly 
fuliginous throughout with metallic reflections, blue at some angles, 
purplish at others and greenish at still others. It is one of the larger 
species of the group. 
