8 IOWA STUDIES IN NATURAL HISTORY 
Described from several specimens taken by H. Mosén in 
Brazil and lent by the Stockholm Museum. This may be a 
distinct species, but I attach it provisionally to sexguttatus as 
I have seen only minor workers. 
The following table may serve to identify the workers of the 
various described varieties and subspecies of sexguttatus. 
1. Epinotum in profile convex and arcuate above. 
Bolivia Werte SN te See eee subsp. biguttatus Emery 
Epinotum in profile straight or more or less depressed above ......-—----- 2. 
2. Mesoépinotal impression feeble; epinotum long, its base in profile 
straight and horizontal, forming a distinct angle with the declivity. 
HE) 2211 [OR na ana aul Sunn RPURNUREE Foe subsp. bastrectus subsp. nov. 
Mesoépinotal impression deeper; epinotum shorter, its base in profile 
high in front, sloping backwards and not forming a distinct angle 
with the declivity (subsp. sexguttatus Fabr.)  --.-.---:-x-cos-ccecem 3. 
3. At least the gaster dark brown Or Dlach wncn-io-ccccenececeemcnee cece 5. 
Gaster as well as head and thorax yellowish red .....-...0:--0c-secso00 4, 
4. Gaster with cream-colored spots on second segment. 
TEED cesses bee, ome ce ef aS var. antiguanus var. nov. 
Gaster immaculate. Montserrat...............- var. montserratensis var. Novy. 
5. Head, thorax, petiole and appendages yellowish red.....-...--.---------- 6. 
At least; the thorax dark, browm or black2 = ite 
6. Spots on the first and second gastric segments fused to form fascie. 
POT eo tee cps St a var. alboteniolatus Fabr. 
Spots on the gaster not fused to form fascie. Grenada. 
FES TEV OS ae ree cee ters fe er SE Ucn es Ee var. grenadensis Forel 
7. Spots on at least one of the gastric segments confluent and forming 
SEIS Cee eco Ee ae shee nea eas teaten den Sucwschteenesue stan 8. 
Spots on the gastric segments not confluent....................- ee cnsemesneereers 4) 
8. Only the spots of the second gastric segment confluent. 
(51 1 Ieee Pe eae mo eC er eA Se var. wniteniatus var. nov. 
The spots of the first, second and third segments confluent to form 
fascize. 9 VBOlUVIa 72s eee ec eee var. ornatus Emery 
9. Antennal scapes in female and worker major surpassing the head by 
a little more than 14 their length; hairs on posterior tibie a little 
loner ‘than’ the® diameter! (0% Ghei tise csersce me eenese nc mcceencrnemeenemeereee 10. 
Seapes longer, surpassing the occiput by 1/3 their length; funicular 
joints longer; hairs on the posterior tibie a little shorter than the 
diameter of the tibie. Brazil, Peru............- var. decorus F. Smith 
