Ants from British Guiana. 3(j9 



Ps. (jracilis^ F., $ . 



Dritisli Guiiiiia, 20. 4. 15. 



Tliis is a most vaiiablc species. Forel (Biol. Ceiit.-Ainer., 

 Foimicidte) says it nests in lioilow stems, where the 5 ^ 

 rest one behind the other, and varies in colour from yellow 

 through red to black with every imaj^inable pattern. 



Ps. elegansj Sm., '^ . 

 British Guiana, 2J:. 5. 15. 



Tribe P n i: i d L I N l, Emery. 

 Pheidole fallax (s. str.), Mayr., 1/ ^ . 



" Tills species is ot' fairly common occurrence in British 

 Guiana. Formicarium constructed beneath the soil.'* 



Tribe Crematogastrini, For. 

 Crematogaster siolli, For., var. guianensis, var. nov., ^, ^ . 



L. 3'2-7 mm. 



These examples of this extremely polymorphic Cremato- 

 gaster differ from the typical form as follows : Head and 

 thorax a lighter chestnut-brown, with the gaster a much 

 darker brown ; the head much smoother, witli hardly any of 

 the irregular punctures so noticeable in Forel's duplicates, 

 ocelli in ^ major di-stinct, the pro-mesonotuui with tiner and 

 more regular longitudinal striation ; the basal surface of 

 epinotum longitudinally striate fanwise (irregularly and 

 transversely striate in stolli), spines of epinotum rather 

 longer. In the 2 minor the sculpture is also tiner and more 

 regular, and the striation on the epinotum similar to that in 

 the %. 



This variety does not appear to be the var. amazonensisy 

 For., from the Amazon and also Costa liica, as the description 

 only refers to the colour and spines, and makes no mention 

 of the sculpture. 



Tribe S L E N P S I D I N I, For. 



Subtribe MOXOMORIINI, Eur. 



Monomorium floricola, Jerd., c?, ? , ^ . 



"• In cocoimf/' Botanic Gardens, Georgetown, 7. -1. 11. 

 A cosmopolitan species. 



