42 
TRANSACTIONS OF THE TEXAS ACADEMY OF SCIENCE. 
is represented there by B. tropicalis Towns, (n. sp.) Not a specimen of 
Trichopoda, Cistog aster, Hyalomyia, or other phasiid, gymnosomatid, 
ocypterid, or phaniid genus, was met with on the lower Rio Grande, ex- 
cepting only Ocyptera euchenor. But some species of diptera, yet unde- 
termined, from the Rio Nautla and Rio Grande are the same. 
Mollusca. — In the September, 1896, Nautilus , Mr. H. A. Pilsbry has 
published a list of terrestrial mollusca, which were all taken on the na- 
tive vegetation. They are as follows: 
1. Helicina flavida Menker and varieties. 
2. Glandina sp. (young). 
3. Volutaxis similaris Strebel. 
4. Praticolella griseola Pfr. Also taken by me on lower Rio Grande. 
5. Praticolella ampla Pfr. 
6. Bulimulus sulphureus Pfr. and varieties. 
It may he added that P. griseola was taken, with Succinea brevis Dkr., 
on orange trees in Tampico, by the writer, Oct. 14, 1894 (see Bull. Div. 
Ent., IT. S. Dept. Agric., Techn. Series, No. 4, p. 16). 
Flora. — The plants, on the flowers of which the bees were taken, were 
sent to Dr. J. N. Rose, who has partially determined them. They were 
later sent to Prof. E. 0. Wooton, who worked some of them out more 
fully. The dates refer to observed time of blooming, and the numbers in 
parentheses are those of my own collecting. They are as follows: 
1. Argemone mexicana Linn. — March to April. Det. Rose. (24) 
2. Malvastrum sp.? — March 13. Det. Towns. (9) 
3. Melia sp. — March 18. Det. Rose. (16) 
4. Vitis sp. — April. Det. Rose (also Wooton). (26) 
5. Frythrina sp.(?) — March 18. Det. Towns. (15) 
6. C alopogonium caeruleum (Benth.) Britton. — March 8. Det. Miss 
Fail. (4) 
7. Hamelia sp. — March 18. Det. Rose. (17) 
8. Vernonia sp. — March 8. Det. Rose. (5) 
9. Solidago sp. — March. Det. Towns. (19) 
10. Baccharis sp. — March 13. Det. Rose. (8) 
11. Melampodium sp. (possibly two spp.). — March 9, and June. Det. 
Rose. (6, 30) 
12. Verbesina sp.(?) — March. Det. Towns. (20) 
13. Bidens leucantha Willd. — March 8. “Rays are pink, instead of 
white as given in description” (det. Wooton). (23) 
14. Cnicus sp. — March and April. Det. Rose (and Wooton). (23) 
15. Cordia sp. probably ferruginea (Auct.?). — June and July. Det. 
Rose. This species occurs from the lowlands up to about 4000 or 4500 
feet. It is known as “barra negra.” As well as being a good bee-plant, 
it is an extremely good fly-plant, a very large number of tropical species 
