35 



The Irish Naturalist. 



March, 



submitted it to Dr. Perkins, and he very kindly informs me 

 that it is Megachile versicolor Smith, a close ally of M. 

 centuncidaris L. These are the Leaf-cutter bees, so called 

 from their habit of cutting pieces out of leaves wherewith 

 to line their nests. 



The species of Nomada are, as I have already remarked, 

 parasitic on Andrena. They are conspicuous insects in 

 yellow and black, or yellow and brow^n, quite unlike their 

 hosts, in fact, most people would call them wasps. I have 

 been fortunate in taking a good man}^ species here, but, so 

 far, have failed to assign tliem to their proper hosts. To 

 accomplish this requires a good deal of time and patience, 

 and, above all, good weather, for the bees are not active 

 except in sunshine. 



PSAMMOCHARIDAE (Pompilidae). 

 Psammochares (Pompilus) nigerrimus Scop. — Portnoo, June. 

 P. gibbus Fab. — Portnoo, both sexes, on sandhills, June, July. 



SPHEGIDAE. 



Passaloecus monilicornis Dhlb. — Poyntzpass, lane, July. 

 Crabro clavipes L. — Poyntzpass, in window and field, August. 

 C. leucostomus L. — Lenaderg, at rose arch, June. 



C. palmipes L. — Portno ), both sexes plentiful on sandhills, June, July. 

 C. varius Lep. 



C. cavifrons Thoms. / ^-^^^^^^^erg, at rose arch, July. 



C. chrysostomus Mor. — Poyntzpass, field at Hogweed, females, August. 



C. lituratus Panz. — Poyntzpass, field, July. 



Oxybelus uniglumis L. - Portnoo, sandhills, both sexes, June, July. 



COLLETIDAE. 

 Colletes montanus Mor. Portnoo, san'dhills. males, July. 



ANDRENIDAE. 

 Sphecodes subquadratus Smith. — Lenaderg, a female, June, 

 S. ferruginatus Schrank^ 



e • ,. . o , , > Portnoo, shore, ]une. 

 S. hyalmatus Schrank J ' 



S. affinis v. Hag. — Poyntzpass, roadside, June. 



Halictus rubicundus Chr.— Portnoo, sandhills and shore, June, July. 

 H. cylindricus Fab. — Poyntzpass, field, September. 

 H. nitidiusculus K. — Poyntzpass, roadside, June. 



Andrena trimmerana Auct., var. scotica Perkins. — Armagh, Poyntzpass, 

 Tempo, April, May, June. This \'ar. has the face beneath the 

 antennae with black hairs. ^ 



1 R. C. L. Perkins, " British Species of Andrena and Nomada," Trans. 

 Tint. Soc, 191 9, p. 218 sqq. 



