Psyche 
[October 
190' 
774 parasites, all females, situated as follows — 386 on the right, 
358 on the left, 30 median; 763 dorsal, 4 lateral, 7 ventral; 40 
under the 3rd., 712 under the 4th., and 22 under the 5th. ab- 
dominal segments. In seven of the eleven cases in which the 
parasite was lateral or ventral, it was one of three parasites; in 
three cases/ one of two; and in only one case was it the only 
parasite. The normal position of the parasite in Chloralictus , 
therefore, is dorsal, under the 4th. abdominal segment. 
It will be noticed that here, as also in the case of the sty- 
lopized Halicti studied by Perkins (1892, 1918), all of the para- 
sites found were females; no males or male exuvia were seen in 
Halictus. This fact at once raises the question of parthenogenesis 
among the females of Halictoxenos already suggested by Perkins. 
Mrs. Schrader (1924), to be sure, has shown that the females of 
Acroschismus must be fertilized to produce their young; but in 
that genus males are of common occurrence and, indeed, in the 
present study were found in much larger numbers than the 
females. Pierce (1918) claims to be the only one who has ever 
captured an Halictus with a male parasite. In view of the very 
rare occurrence of males of Halictoxenos, then, or their almost 
complete absence, parthenogenesis is strongly suggested in this 
group notwithstanding Mrs. Schrader’s contrary observations on 
Acroschismus. 
Andrena. 
147specimens 
18 
3 
3 
1 
2 
174 
(41 d 1 , 
( 4d\ 
( 
106 9 )carrying 
14 9) “ 
3 9) “ 
: 3 9) “ 
: 19) “ 
: 29) “ 
(45 d\ 129 9) 
parasite (40 cf 107 9). 
parasites ( 36 9). 
“ ( 6b 1 ). 
( 3 cf , 39). 
( 39). 
1 
29 
2 d 71 
Id", 19 “ 
3 9 
1 larval parasite 
200 parasites (49 cf, 149 9 , 2 larval). 
Average infestation: — 1.1 parasites per host. 
200 parasites (49 c? , 149 $ , 2 larval) situated as follows : — 97 on 
the right, 93 on the left, 1 median, 3 unextruded, 6 unrecorded; 
187 under the 4th., 9 under the 3rd., 1 under the 5th. abdominal 
segments, 3 unextruded. The normal position for the parasites 
of Andrena is obviously under the 4th. abdominal segment. 
