96 AMERICAN HYMENOPTERA. 



but the roughened base is reduced and the pit and marginal area run 

 somewhat together, the end of the latter (mesad) being well defined, 

 and pointed. Fifth abdominal segment with an entire narrow light 

 hair band, sixth with a heavy dark chocolate colored fringe. 



edwardsii vagabunda Ckll. 



In Bull. So. Cal. Acad. Sci., February, 1905, p. 31, I describe a 

 variety of T. angustior (Ckll.), having pale hair bands on segments 

 4 and 5 of abdomen. This insect, from Los Angeles, California, is 

 exactly vagabunda, except that it has the fulvous thoracic pubes- 

 cence of true edivardsii. 



I have beft)re me a male labelled edwardsii type, one of Cresson's 

 original specimens. It has the hair of thorax above light fulvous; 

 last ventral segment much as in vagabunda, the marginal area 

 united with the pit, and sharj)ly pointed and well defined mesad ; 

 second submarginal cell conspicuously broader than high, which is 

 not the case in vagabunda. This male, however, has the hair 

 of the apical segments of the abdomen all black, and only black 

 hair on the second segment. It is, in fact, the insect which passes as 

 male 1\ acerba. 



The description of T. edwardsii refers to pale hair on the second 

 segment, and so it is evident that the original series (of six) con- 

 tained two species, and there is no occasion to unite edwardsii with 

 acerba. The true edwardsii must be identified with the form which 

 I named angustior, though the description indicates that the series 

 may also have included vagabunda. ("Sometimes the fourth and 

 fifth segments have each a narrow, indistinct, subapical fascia of 

 white pubescence.") 



In Proc. Acad. Nat. Sci. Phila., 1897, I recognized two races of 

 T. edwardsii, which I named latior and angustior. Prof. Kincaid 

 collected them in large series in Washington State, and found only 

 latior at Olynipia and Seattle, near the coast, and only angustior at 

 Pasco, inland. Mr. Viereck's account of the distribution in Canad. 

 Ent., 1905, p. 315, is misleading, but he has ascertained that both 

 forms occur at Corvallis, Oregon. Some time ago I became con- 

 vinced that these two supposed races were quite distinct species, and 

 thinking that latior was the real edwardsii, proposed angustior as a 

 valid species. Since it appears that angustior is edwardsii, it is 

 latior that must be raised to specific rank ; but it has an earlier 

 name given by Provancher (as Melissodes), and will stand as Tetra- 

 lonia lata (Prov.). 



