1965] 
Bush — Zonosemata 
317 
43, 88, 98, 190. — Aczel, 1954, Dusenia 5: 152-157, figs. 19-27. — Foote, 
I960, Proc. Biol. Soc. Wash. 73: 114-116. 
Zonosemata variegata 6 Aczel, 1954, Dusenia 5: 162, 164 figs. 19-27; estampa 
II. C (nomen nudum). 
diagnosis. Detailed descriptions of this species have been pre- 
sented by Aczel (1954) (adult), and Phillips (1946) (larva). 
Body and wing measurements are presented in Table 1. Z. vittigera 
can be distinguished readily from all other members of this genus 
by the presence of a pair of black dots before the transverse suture 
(Fig. 36), and by the presence of a black stripe or distinct spot on 
the sternopleuron (Fig. 35). The abdomen has a pair of baso-lateral 
spots on the last segment in both sexes (Figs. 11, 12). Occasional 
individuals may also have small brown spots on the penultimate 
segments. The wing pattern of vittigera (Fig. 5) is very similar 
to that of minuta (Fig. 7), but usually can be distinguished from 
that of electa (Fig. 4) by the fact that the medial and subapical 
bands are joined in the latter species. 
variation. The intensity of the black pigmentation of the pre- 
sutural spots varied a great deal in the specimens available for study, 
particularly in those from Texas. Many of these specimens have the 
presutural and sternopleural black spots generally diluted and the 
postscutellum often predominantly yellow. Hybridization beween 
electa and vittigera could account for the reduction in the degree 
of black coloration in the latter species. However, this seems unlikely 
as there is no indication of introgression, such as a tendency toward 
reduction in size or an increase in the intensity or distribution of 
‘'Although Aczel used the name vittigera throughout the text of his 1954 
paper, he labelled the accompanying illustrations variegata. I have also 
examined specimens bearing the name variegata on a type label in Aczel’s 
handwriting in the USNM collection. Dr. Alan Stone of the USNM found 
Aczel’s manuscript species variegata to be synonymous with Coquillett’s 
vittigera after comparing the types at Aczel’s request (from correspondence 
between Stone and Aczel, 1952, USNM). Aczel therefore apparently made 
the necessary change in the text but failed to do so for the plate before the 
paper was published. 
Explanation of Plate 24 
Figs. 28-29, 31-32, 35. Thorax, lateral view, Zonosemata spp.: (28) $ 
cocoyoc, paratype, Morelos, Mex. ; (29) $ electa , N. J., U. S. A.; (31) 
$ minuta, type, Jamaica, W. I.; (32) $ vidrapennis, paratype, Mexico, 
Mex.; (35) $ vittigera, Texas, U. S. A. 
Figs. 33-34, 36-38. Thorax, dorsal view, Zonosemata spp.: (33) $ min- 
uta, type, Jamaica W. I.; (34) $ vidrapennis, paratype, Mexico, Mex.; 
(36) $ vittigera, Texas, U. S. A.; (37) $ electa, N. J., U. S. A.; (38) $ 
cocoyoc, paratype, Morelos, Mex. 
Fig. 30. Head, electa $, N. J., U. S. A. 
