44 Messrs. T. D. A. Cockeiell and E. Atkins on 



e. First joint of labial palpi very 



loui? Calliopsis coloradenshi, 



ee. Firstjoint of labial palpi some- [Cressou. 



what shorter ; tongue con- 

 siderably surpassing labial 

 palpi Calliopsis chlorops, Ckll. 



The Nomada figured by E. Saunders {I. c.) has the labial 

 ]ialjn of tlie type of A^. xanthopMla^ but the galea, as figured, 

 is more like that of Panurglnus Boylei. Saunders does not 

 state the species. The species with the A^. xanthophila type of 

 palpi may be regarded as typical Nomada. 



Nomada modesta, with the cliaracters indicated in the table, 

 may be taken as the type of a new subgenus, Micronomada. 



Calliopsis verbenoi, witii its long galea not abruptly 

 narrowed at apex and the extremely long basal joint of labial 

 palpus, may form the type of a new subgenus, Verhenapis. 



We believe that Phileremulus, Neolarra, and probably 

 AUodape are related to Nomada, and are therefore also derived 

 from Panurgine ancestors. 



EpeOLUS, Latr., 1802. 



This genus is parasitic on CoUetes, but cannot be derived 

 therefrom. From all the genera discussed in connexion with 

 Nomada it differs by its greatly reduced maxillary palpi, 

 which have only two joints. Many species found in North 

 America, formerly referred to Epeolus, have three-jointed 

 maxillary palpi, and constitute the genus Triepeolus of 

 Hobertson (1901). Kobertson thinks that Triepeolus is 

 ])robably a parasite (or, rather, inquiline) of the Melissodinai. 

 Examining Triepeolus verhesince (Ckll.) as an example of the 

 Epeolus type, we find that it has a broad blunt galea, with 

 erect bristles at intervals on the outer margin, such as we 

 find in several of the A'omacfa- Panurgine series. But the 

 whole of the mouth-parts indicate the closest affinity with 

 Phileremus. The characters which remove Epeolus and 

 I'hileremus from the Aowao^a-Panurgine series are the reduced 

 maxillary palpi, and the broadened and flattened two basal 

 joints of the labial palpi, with the two terminal joints 

 diverging laterally, as in the ordinary long-tongued bees. 



At this point we note that Calliopsis chlorops (a veritable 

 Panurgine) has the first joint of tiie labial palpi broadened 

 and flattened, while its paraglossaj are very like those of 

 Epeolus. Furthermore, the series of Phileremulus &c., while 

 departing very much in many respects from Phileremus or 

 the Panurginge, nevertheless forms in some ways a connecting- 

 link between these groups. Phileremulus is remarkable for 



