XIII, D, 4 Cockerell: Megachilid Bees 141 



our bee the antennal character is not constant and there is more 

 reason for considering the form an ordinary gynandromorph. 

 Therefore I give it the same specific name as that of the species 

 from which it appears without doubt to have been derived. In 

 discussing A. detersa, of which both sexes are known, I wrote 

 as follows: 



Mr. R. E. Turner examined 14 female specimens in his collection, and all 

 had 13-jointed antennae and wholly lacked a ventral scopa. [It should be 

 added that the anterior coxas are spined.] It is, therefore, certain that this 

 is a normal condition, and must represent an early stage in the evolution of 

 a parasitic species, like those of Ccelioxys and Stelis. From the stand- 

 point of genetics, it is an extraordinary case, since the female seems to 

 have dropped her secondary sexual characters and thereby assumed those 

 of the male, which were present in her genetic constitution. It is note- 

 worthy that the sting, a modified primary character, is retained. It 

 appears that in Megachile the female is heterozygous for the secondary 

 sexual characters, with the female characters dominant. 



Thus a new generic type has been produced by the simple dropping out 

 of one set of characters. It may be objected that the insect is still essen- 

 tially a Megachile, and this is indeed true as regards its major characters, 

 but according to any logical system of classification it must go in a 

 distinct generic group, as otherwise our current definition of Megachile, 

 applicable to hundreds of species all over the world, breaks down. 



Presumably the male of Androgynella suhrixator cannot be 

 distinguished from Megachile suhrixator. 



Genus HERIADES Spinola 



Heriades sauteri philippinensis Friese subsp. nov. 



Female. — Like H. sauteri Ckll., from Formosa, but more finely 

 punctured on mesothorax and first abdominal segment. Very 

 small bees, a little over 6 millimeters long, with white ventral 

 scopa. 



Luzon, Laguna, Los Banos {Baker 550), Mount Banahao 

 {Baker) . Doctor Friese had named this in manuscript as a 

 distinct species, H. 'philippinensis; I publish the name with his 

 permission. It is so close to the Formosan H. sauteri that I was 

 at first disposed to consider it identical. Friese very probably 

 bestowed his manuscript name before H. sauteri was published. 



APPENDIX TO XYLOCOPID^ AND CERATINID^ 



Mesotrichia subvolatilis sp, nov. 



Male. — Length, about 21 millimeters ; anterior wing, 19 ; en- 

 tirely covered with rich orange-yellow (not at all green) hair; 

 apex of abdomen with ferruginous hair, not at all mixed with 

 black; clypeus roughened, with broad median longitudinal and 



