T. D. A. COCKERELL. 93 



The occurrence of M. suffusa, and especially of M. communis, in 

 Arizona was quite unexpected. 



I omitted to state, in my original account of Melissodes martini, 

 that it visits the flowers of Petalostemon oligophyllus. 



TETRAL.ONIA Spinola (Synhalonia Pattou). 

 Tetralonia fedoris u. sp. {rosse var. ?). — % . Length 11 mm. or slightly 

 more; antennae about 10 nun.; black, the abundant pubescence of thorax light 

 yellowish ochreous, without any black; hair of cheeks long and white; of legs 

 dull white, most of that on outside of middle and hind tibise and hind tarsi with 

 a strong sooty stain ; hair on inner side of basal joint of hind tarsi reddish choco- 

 late color; hind spurs normal; clypeus strongly punctured, entirely lemon-yel- 

 low ; labrum yellowish white, with very pale reddish hair; mandibles with a 

 small yellow spot; antennae entirely black; mesothorax strongly punctured, the 

 middle feebly shining; tegulse testaceous; wings suffused with reddish; second 

 submargiual cell broad, receiving the first recurrent nervure a little before the 

 beginning of the last fourth ; abdomen very shiny, punctured, the sides of seg- 

 ments 2 to 4 with short greyish white tomentum, the same forming a continuous 

 band on the fifth segment; sixth with a heavy fringe of dark fuscous hair; 

 sides of apex with a rudimentary tooth, short, low and broad. 



Hab. — Fedor, Texas, May 5, 1901 (Birkmmm). In Robertson's 

 table this runs to T. rosce Rob., of which it may be a variety or 

 race ; but I have never seen T. rosce, and Robertson's account makes 

 no reference to the more striking characters of the present insect. 

 It is quite similar in general appearance to T.frater Cress., but is 

 readily known from that by the shorter (about half as long) third 

 antennal joint, yellower hair of thorax, spot on mandibles, broader 

 apical plate of abdomen, dark hair of sixth abdominal segment and 

 sooty hair on hind tibiae, etc. From T. trutke Ckll. it differs at 

 once by the strongly punctured, rather shiny mesothorax. 



Tetralouia birkinaiiiiiella n. sp.— '^ . Length about 11 mm.; 

 black, hair of thorax dull white, with an ochreous tinge above; clypeus pale 

 lemon-yellow, the yellow rectangularly notched at the sides; labrum yellowish 

 white, with white hair; mandibles with no yellow spot; antennae entirely black, 

 third joint conspicuously longer than broad ; scape short and thick ; mesothorax 

 strongly punctured, the middle shining; tegulse testaceous; abdomen with grey- 

 ish white tomentum, forming distinct bands; fringe of sixth segment white; 

 hair of legs white, that on inner side of basal joint of middle and hind tarsi 

 orange-ferruginous; middle and hind tarsi slender and rather long ; hind spurs 

 normal. 



Hab. — Fedor, Texas, April 1, 1898 {^Birkmann). 

 Another hymenopterist had labelled this T. lepida Cress., but it 

 differs conspicuously from one of Cresson's cotypes of lepida, though 



TBANS. AM. BNT. SOC. XXXII. JANUARY, 1906. 



