94 
Psyche 
[September 
ondary constrictions were observed. Forty metaphase plates were 
photographed from seven larvae. Over 80 larval brain squashes were 
studied but not photographed. 
Source of cytological material. Cocoyoc, Morelos, Mexico. 
Host plant. Inga inicuil Cham. & Schlecht. 
Collections were made from August through October, 1957. 
Anastrepha spatulata Stone 
Figure 9 
The diploid number is 12 in the male. The MCA number is 14, 
as one pair of chromosomes is metakinetic. The male has a small rod- 
shaped Y chromosome about 1/4- 1/3 the length of the X chromo- 
some. Only eight adult males were available for study; three of these 
gave suitable preparations for analysis. From these, four sperma- 
togonial metaphase plates were obtained. Several photographs were 
taken of one particularly good metaphase plate that regrettably did 
not lie in one plane. A drawing made from a composite photograph 
is therefore presented in Figure 9. 
Source of cytological material. Canyon de Lobos, Morelos, Mexico. 
Host plant. Unknown. 
Adults were collected from January to March 1957 in glass traps, 
using fermenting brown sugar as a lure (Baker et al., 1944). Each 
adult was maintained for two weeks in the laboratory on a standard 
laboratory diet (Rhode, 1957) prior to examination. 
Anastrepha striata Schiner 
Figure 4 
The diploid number is 12 in both sexes. The MCA number is 16. 
Two pairs of chromosomes are metakinetic. The shorter metakinetic 
chromosomes have secondary constrictions on their longest arms. The 
dot Y chromosome is present in the male and is about 1/4 to 1/3 
the length of the X chromosome. Seventy-one plates were photo- 
graphed from 20 larvae. Approximately 175 larval brain squashes 
were studied but not photographed. 
Source of cytological material. Tequila, Jalisco, Mexico. 
Host plant. Guava (P sodium guajava L.). 
Collections were made from Tequila during the month of August 
1957- Other collections were made from guava in the states of Vera- 
cruz, Chiapas, Morelos, and Michoacan in 1956 and 1957 with no 
variation in chromosome morphology noted. 
