Dec, I9II.] Wheeler: Fungus-Growing Ants from Texas. 249 



5. Body covered with white scales in addition to the hooked hairs ; first gastric 



segment depressed above, compressed on the sides, subtruncate and 



bigibbous behind. Length 4.5 mm. Para farinosa Emery. 



Body not covered with white scales ; first gastric segment not bigibbotts 

 behind 6 



6. Color ferruginous ; gaster with feebly developed median dorsal impression 



and lateral ridges. Length 3-3.75 mm. Texas turrifex Wheeler. 



Color brownish yellow ; gaster without median dorsal impression or lateral 

 ridges. Length 2.5-2.8 mm. Texas .... fMrn/e,r subsp. caroli subsp. nov. 



7. Thorax and gaster between the tubercles and ridges covered with numerous 



small whitish scales. Length 4 mm. Costa Rica. . . .squamulifera Emery. 

 Thorax and gaster without whitish scales 8 



8. Posterior corner of head in profile with two spines ; inferior pronotal spine 



acute ; first gastric segment with a deep median and two somewhat 



shallower lateral, longitudinal impressions 9 



Posterior corner of head in profile with three spines ; inferior pronotal spine 

 obtuse ; first gastric segment without deep longitudinal impressions. 

 Length 3.8-4 mm. Sao Paolo oetkeri Forel. 



9. Color yellowish ferruginous, with the head, venter and a median longitudi- 



nal stripe on the first gastric segment, brown. Length 4 mm. 



Trinidad urichi Forel (typical). 



Color dark brown, with slightly paler legs and scapes. Length 3.5—4 mm. 

 Matto Grosso urichi var. fusca Emery. 



10. Preorbital carina but little deflected posteriorly into the antennal scrobe ; 



posterior corner of head in profile with two prominent, widely separated 

 spines ; pronotum without median spines ; first gastric segment with three 

 broad and rather deep, longitudinal impressions. Color deep ferruginous, 

 with the gaster, most of the head and portions of the thorax and legs, 

 black. Length 3.5-4.5 mm. Jamaica, St. Vincent, Culebra L Bahamas. 



jamaicensis Ern. Andre. 

 Preorbital carina curved mesially behind and continued some distance over 

 the antennal scrobe ; posterior corner of head in profile with a single 

 small, simple or bifid spine and several tubercles ; pronotum with a pair 

 of median spines or bifid tub^cles ; first gastric segment without longi- 

 tudinal impressions. Color yellowish brown or ferruginous with the 

 infuscations restricted to spots on the head and gaster or, more rarely, 

 on the thorax 11 



11. The three pairs of lateral spines of the pro- and mesonotum short, blunt 



and of similar shape, being projections rather than spines. Length 2.5— 



3.5 mm. Arizona desertorum Wheeler. 



The three pairs of lateral spines of the pro- and mesonotum of different 

 shapes, the first pair being decidedly longer and more pointed than the 

 others 12 



12. Median prothoracic spines acute, nearly as long as the lateral pair; meso- 



notum with two pairs of subequal spines; petiole ij4 times as long as 

 broad ; first gastric segment with only about fifty tubercles on its dorsal 



