90 AMERICAN HYMENOPTEKA. 



to 13 mm.; male, 12 mm. to 13 mm. Spread of wings: queen, 38 

 mm. to 39 mm. ; worker, 20 mm. to 30 mm. ; male, 28 mm. to 29 mm. 

 Width of abdomen at second segment: queen, 9 mm. to 10 mm. ; 

 worker, 4 mm. to 6 mm. ; male, about 51 mm. 



The queen is here redescribed from twelve, and the worker 

 from eight, specimens. 



Vaj'iation. — The difference between the typical ephippiatus 

 worker and its color variant lateralis is that in the former 

 there is some yellow hair on the basal middle of the third 

 abdominal segment. The color variant /a/<fm//5 is, however, 

 by far the more common form and, for this reason, is in 

 reality the typical form of the species. 



The difference in coloration between the queen and the 

 other castes is very remarkable. I place the different castes 

 together here, as I do, on the authority of Mr. J. C. Craw- 

 ford (vide supra), who states that many queens and workers 

 were taken from the same nest at the Volcano Irazu, Costa 

 Rica, by Prof. Lawrence Bruner in 1902. 



Smith (vide supra) describes a worker color variant, which 

 is not known to me, as follows : " Var. The yellow pubes- 

 cence on the abdomen is on the sides only of the first and 

 second segments." 



Crawford (vide supra) says of the worker: "Pubescence 

 of second and third abdominal segments sometimes red- 

 dish." I have not seen a worker, which I feel certainly 

 belongs to this species, that shows this character, and I 

 should be slow to consider that a worker with this character 

 belonged to this species unless I found it in the same nest 

 with typical forms of the species. I have not seen the speci- 

 mens from Prof. Bruner's nest, but I should not be surprised 

 to find that it did not contain such a worker. It seems to 

 me that workers with this character are as likely to belong 

 to pulcher as to ephippiatus. H. Friese (vide supra) has 

 described a color variant of the queen as follows : " var. — 

 thorax above and segments four to six fuliginous — pilose — 

 var. {uliginosMsy I have seen no specimen so colored. 



Habitat. — We have the following certain records for this 

 species: Mexico, Guateinala (Val de Fuego), Costa Rica 



