222 
Psyche 
[September 
Fig. 25. Upper. Tegmen of B. craniifer showing the distribution of the 
long setae on the marginal and scapular fields. Lower. Anterior view 
of part of the tegmen showing the characteristic hairlike setae. 
2. Anterior elevations usually rounded, present on the left and often 
on the right sides. Differences in size between anterior eleva- 
tions on the right and left sides not great. Preputial spines 
numerous, usually on the left and right sides and often occur 
in more than a single row (Figs. 76, 77, 79-82, 84-91, 93-1 11, 
211-214). In colosseus the left preputial spines usually occur 
in a single row (Figs. 116-129) Brasilianus Group. 
Truncate or rounded elevations usually present only on the left 
side and generally much larger and more robust than spines 
on the right. Preputial spines usually less numerous than in 
the Brasilianus Group, and are often arranged (when present) 
in a single row on the left, and single or sometimes double or 
partial double row on the right. Spines on the right side usually 
more numerous than on the left (Figs. 1 33- 1 53, 1 55-170, 174- 
198, 200, 201, 203, 204, 210) Atropos Group. 
Giganteus Group. — Two species of Blaberus ( giganteus , Figs. 
26, 27; craniifer , Figs. 41-46, 58-61) belong to this group. A useful 
tegminal character which Princis (1946) described can be used to 
distinguish B. craniifer from all other species of the genus. In 
craniifer the marginal field and scapular field of the tegmina have 
diffuse projecting hairs (Fig. 25). According to Princis, no other 
