armatures hi the Ift/niennpteroKS genus Colletes. 43 



also on segment 2. Tlie legs in all are rather slender, 

 and the third antennal joint is always shorter than the 

 fourth. In puneturation they ditfer considerably, and 

 also in the length of the gena% the sculpture of the 

 propodeum, and the structure of the apical segments both 

 dorsal and ventral. These differences seem enough to 

 separate them as distinct species, but I feel sure that they 

 must be very near relations. 



BaJtcatus seems to be a fairly common and widely 

 distributed species in the Mediterranean and also in the 

 Alpine districts (Spain, S. France, the Adriatic, Switzer- 

 land, Tyrol, etc.). I have taken it quite high up on the 

 Simplon Pass. It is not British, nor (I believe) does it 

 occur in Scandinavia or North Germany — hence it is 

 unlikely that Thomson's haJteatus is this species. 



Though Radoszkowski tigures our marginatus as "&«/- 

 icatus, Latreille " (sic),* he also tigures what I think must 

 be the present species under the name " marginatus," 

 which name of course it cannot bear in any case. 



Prof Perez at one time identified this species with 

 lacnnatus, Dours, under which name it is placed in some 

 collections. But Dours's description does not suit it in 

 the least, and M. Perez tells me that he accepted the 

 identification on the faith of a correspondent, and has now 

 abandoned it. 



A correspondent sent me a ^ and ^ of this species as 

 " sierre7isis, Fiey Gessner," and I have myself taken it at 

 i>ierrc ! But I have not seen Frey Gessner's types, and 

 another insect that has come to me under the same name 

 is certainly marginatus. Smith. If sierrcnsis really = my 

 halteatus, I should be inclined to adopt the former name, 

 as there really seems no particular reason for identifying 

 our insect with Nylander's species. 



2. Uous, n. sp. (?). PL VT, 2, 2«. 



Species a balteato vix di.stiiigueiula, nisi segnienti sepLimi ventralis 

 loljis niagis elongatis, apicciii versus minus dilatatis, niargine apicali 

 vix sinuatu, et praecipue peliolis luljorum nudis (uec ciliatis nee 

 punctatis), I'urtasse qiioqtie numero (13) liamulorum iu alis inferi- 

 uribus. J long, circa 10 mill., 5 latet. 



Helenensdorf, Transcaucasia (?), Pola (?). 



* BaUeatus, Latreille, is a nullity. Succinctiis, LAtreil\e = halteatus, 

 Nylander. 



