1962 ] Bush — Genus Anastrepha 93 
Source of cytological material. Tamazunchale, San Luis Potosi, 
Mexico. 
Host plant. Volador ( Zuelania guidonia Britt, and Millsp.). 
Collections were made from late May to early July 1957. The 
larvae were found only in the fruit of the above host plant. 
Anastrepha fratereulus (Wiedemann) 
Figure 3 
The karyotype of this species cannot be distinguished from those 
of A. mombinpraeoptans and A. distincta at metaphase. The diploid 
number in both sexes is 12. The MCA number is also 12, with all 
chromosomes acrokinetic. No morphologically differentiated hetero- 
chromosomes (XY) or secondary constrictions were observed. One 
hundred twenty-eight metaphase plates were photographed from 32 
larvae. Over 250 larval brain squashes were studied but not 
photographed. 
Source of cytological material. Monte Blanco, Veracruz, Mexico. 
Host plant. Rose apple ( Eugenia jambos L.). 
Collections were made from early July to late August, 1957. 
Anastrepha mombinpraeoptans Sein 
cf. Figure 3 (A. fratereulus) 
The karyotype of this species cannot be distinguished from those of 
A. fratereulus and A. distincta. The MCA number in both sexes 
is 12. No morphologically differentiated heterochromosomes (XY) 
or secondary constrictions were observed. Forty-six metaphase plates 
were photographed from 14 larvae. More than 150 larval brain 
squashes were studied but not photographed. 
Source of cytological material. Cocoyoc, Morelos, Mexico. 
Host plant. Hog plum ( Spondias mombin L.). 
Collections were made from September through October, 1957. 
Larvae which were reared from mangoes (M. indica) collected from 
Veracruz from June through July, 1957 were also studied. 
Anastrepha distincta Greene 
cf. Figure 3 (A. fratereulus) 
This species cannot be distinguished from either A. mombinprae- 
optans or A. fratereulus. It has an MCA number of 12 in both sexes. 
No morphologically differentiated heterochromosomes (XY) or sec- 
