A SMALL COLLECTION OF BEES FROM JUAREZ, MEXICO. 217 



Genus Libellula. 



A. Platktkum. 

 Sp. 1. depressa = Libellula depressa. 



2. conspurcata = Libellula fulva. 



B. Leptetrubi. 



3. quadrimaculata = Libelhda quadrnndculata. 



4. praenubila = Libellula quadrimaculata var. prcEnuhila. 



C. Orthetrum. 



5. bimaculata = Libellula fulva, $ , and teneral ^ . 



6. cancellata = Orthetrum cancellatum . 



7. caerulescens = Orthetrum. ctRvulescens. 



D. Sympetrum. 



8. Scotica = Sympetrum scoticum. 



9. pallidistigma = Generally considered to be immature S. 



scoticum ; but the size, pale legs, and the long pterostigma 

 seem rather to point to <S'. striolattmi. 



10. rufostigma = Sympetrum sanguineum . 



11. angustipennis = probably immature S. sanyuineum. 



12. vulgata = Sympetrum. striolatum. 



13. basalis = apparently immature S. sanyuineum. 



14. jfiiaveola = Sympetrum flaveolum. 



ON A SMALL COLLECTION OF BEES FROM JUAREZ, 



MEXICO. 

 By T. D. a. Cockerell, M.M.Agr.Exp.Sta. 



On Oct. 6th, 1899, I had the opportunity of spending a little 

 while at Juarez, in the State of Chihuahua, and of collecting 

 there the bees enumerated below. The' species marked with an 

 asterisk had not previously been reported from Mexico. 



*(1.) Halictus pectoraloides, Ckll., one female, at flowers of 

 Aster {Leiicosyris) spinosus. 



*(2.) Perdita sphceralcece, Ckll., one female, at flowers of 

 Sphceralcea fendleri lobataA 



*(3.) P. heliotropii, Ckll. ; see Entom., 1900, p. 63. 

 (4.) P. albipennis var. helianthi, Ckll., one female, at flowers 

 of Helianthus annuus. 



*(5.) Andrena pulchella, Rob., one female, at flowers of Heli- 

 anthus annuus. 



(6.) Melissodes agilis, Cress., one male, two females, at 

 flowers of Helianthus annuus. 



f This is Sphceralcea lobata, Wooton, Bull. Torrey Bot. Club, xxv. 1898, 

 p. 306. At Mesilla Pa'k, N.M., it varies into a form having leaves exactly as 

 in the type of 8. fendleri, Gray, of which it may be considered a subspecies. 

 The plant is new to the flora of Mexico. 



