228 [October, 



of the smaller species. The legs also are darker in conjitngens, e.g., 

 the middle femora are largely black and the hind metataisi entirely so. 

 This is so in all the specimens I have been able to examine, viz., a ? 

 at South Kensington, received from Schmiedeknecht as "dallatorreana'' ; 

 another which I took at Bozen in July, 1907, and identified from 

 Schmiedeknecht' s Tables as dallatorreana ; a third given to me as 

 '' conjungens'' (I believe by Perez when I last visited him), dated 

 " 21.v.'02," and with certain initials indicating its precise locality which 

 as yet, however, I have failed to interpret ; and lastly my own Swanage 

 specimen. The only (^ I have seen is that sent by Schmiedel^necht 

 with his ? to South Kensington, and placed with it as " dallatorreana 

 Schmiedeknecht" in the General Collection there. 



All these $ $ appear to me to belong to one species, and they all 

 differ from flavogutfata, in the characters mentioned above. 



N. conjungens has been now found in most countries of western 

 and central Europe, viz., France, Germany, Austria, Switzerland, Italy, 

 and England, but is everywhere considered a great rarity. What 

 species of Andrena it infests is unknown. f But, though only as a 

 guess, I would venture to suggest that its host may be Andrena 

 proxima. I caught a good many specimens of the latter, though 

 unluckily on flowers only — some kind of umbellife'rs— not at their 

 burrows, on the same day on which I met with the Nomada. A. proxima 

 is one of the less common species of the niinutula group, and is also 

 the largest of them. Now JIavoguttata is known to infest small species 

 of that group, and it seems to me not improbable that a similar 

 association may exist between the larger forms N. conjungens and 

 A. proxima. The latter, though not such a rarity as the former, cannot 

 be called a common species. Schmiedeknecht says that though widely 

 distributed it is " nirgends haufig " ; but, as to its actual distribution 

 in Europe, I believe that wherever conjungens has occurred proxima 

 occurs also. I would venture to advise, then, that collectors who have 

 the opportunity of doing so, should for the future keep an eye on the 

 burrows of proxima in the early summer, and examine carefully any even 

 common-looking red and yellow Nomada that may be flying near them. 



Woking : 



September 5th, 1916. 



t Since this paper was printed I have seen it stated by Alfkon (Danzig, 1912) that he has 

 found N. conjnnyrns near Bi'emen, at the burrows of A. proxima, wliich (and not, as he formerly 

 said, A. chrytoiccUs) must "certainly " be its host. Ho records it also from Sjiain, and says that 

 it sometimes occurs in numbers in certain North-west German localities. 1 hear also from 

 Dr. Perkins that he has for some years known of this association, and has been looking for 

 conjung(ns in his own neighbourlioud — where, as well as at Swanage, A. proxima occurs — but has 

 not yet found it. 



