armatures in the Hymcno'pteroiis genus Colletes. 41 



29. Middle joints of antennaB (PL IX, 54) about as 



broad as long (they seem to be flattened in a 

 peculiar manner beneath). Face very short 

 and broad, differing evidently from all the 

 following species, except perhaps caspinis 

 (See Pl.VI, Sa and 10a). A small species, 



circ. 7 mill. long. (S. France) 10. chohauti, Perez. 



Middle joints of autenuw considerably longer 



than broad. Species larger ... ... ... ... 30. 



30. Area trigona of propodeum crossed by large 



clathrate rugosities, its lateral areas also 

 lai-gely rugose, looking in some lights almost 

 strigose. Eyes not very convergent. Apex 

 of seventh dorsal plate narrowly rounded, 



almost pointed T. hj/fci'ifo)-mis,Eversm. 



Disc of area trigona mostly quite smooth ; the 

 lateral areas punctured, rugosely, but with 

 no appearance of strigosity ... ... ... ... 31. 



31. Apical half of sixth ventral plate abruptly 



depressed; its central part is pale shining 

 and almost impunctate. Face wide and 

 short with eyes converging strongly : the 

 vertex elevated. Dorsal apex much as in 

 hylwiformis. Hind tarsi rather wide — the 

 first joint not above four times as long as 



broad {six times in the species following!) ... 8. caspicus, Morawitz. 

 Sixth ventral plate less sharply sculptured, and 

 its central part evidently rather largely 

 punctured. Apex of last dorsal plate wider, 

 subtruncate, with a slight central incision. 

 Face squarer, the eyes converging only 



slightly. Lateral areas of propodeum not , j^^^^^^^^^^ j^, ^.^^^^^^ ^^ 

 so strongly and closely punctured j g ^^^^^ ^ J •' 



I can at present give no external character that satisfies me for separating 

 these two. (See below, Notes on the Species.) 



Notes on the Species Figuked. 



Species with UDincised stipites 1-10. 



1. Balteatus, Nyl. (?). PI. VI, fig. 1, la, Ih. PL IX, figs. 

 63, 64. 



I call this species halfeatus on the authority of Prof. 

 Perez and several other correspondents from whom I have 

 received it. But whether it is really Nylander's species 

 I do not know. If, as I believe, it does not occur in 

 Northern Europe, it obviously cannot be the balteatus of 

 Thomson. 



Nylander first proposed balteatus as a name for Latreille's 

 sueeinctus, which he considered not to be the suceinctus of 

 Linne. But I can find nothing either in Latreille or 

 Nylander to show what the insect really was which 

 Latreille called suceinct^ts. Several species seem to me 



