T. D. A. COCKERELL. 85 



ceiice, black on basal joint of anterior tarsi. The above is from the 

 description of Cresson, which makes no explicit reference to the 

 hind tarsi ; but I examined the type, and found that they have the 

 hair red. 



(3.) From the description, Melissodes tepida Cress., from Nevada, 

 comes in this group. It has the abd. segments 2-4 almost entirely 

 covered with short, dense, pale, appressed, ochraceous pile, and has 

 a patch of pale pubescence on each side of segment 5. 



(4.) Melissodes donata Cresson (type examined) is from Mexico, 

 and runs to Tetralonia cordleyi fairly well in the table; the fifth 

 abd. s. appears black, with the marginal fringe dark chocolate, con- 

 trasting, and the hair of apical segment is dark chocolate. Seg- 

 ments 2 to 4 have broad, even marginal bands of light cinereous 

 tomentum ; the mesothorax is dullish but very strongly and closely 

 punctured, and it has erect fuscous hair ; flagellum a sort of sepia 

 brown beneath. Apparently close to T. uctuosa (next to which it is 

 placed in the Cresson collection); it differs principally from actuosa 

 by the much coarser sculpture of mesothorax, and the smaller size. 

 I have not seen the palpi, but I think the species may be safely 

 written Tetralonia donata. 



Group K. 



Hair on inner side of basal joint of hind tarsi black or dark fuscotis. 



Abdomen shining black, with only one white hair band, which i? on fourth seg- 

 ment, but a white spot on each side of third ; flagellum all black. 



Tetralouia acerba (Cress.). 

 Abdomen not thus ornamented ; bands two or more, though sometimes weak. .1. 



1. Eyes green; flagellum fulvous beneath; thorax above with fulvous pubes- 



cence ; abdominal bands white, as broad as the black intervals be- 

 tween them. . .Melissodes ( Martinella) luteicoriiis Ckll. 

 Eyes not green, or if greenish, then pubescence of thorax not fulvous 2. 



2. Pubescence of thorax above deep fulvous ; size moderate ; species of E. States. 



H. deiitiventris Smith. 



Pubescence of thorax above pale ochreous, oi' greyish ; mostly larger, robust 



species, all of the W. States 3. 



3. Basal declivity of first abdominal segment with sooty liair; very large and 



robust species M. chrysothanini Ckll. 



Basal declivity of first abdominal segment without sooty hair; species not so 



large, though M. mizese is nearly as large 4. 



•i. Hair on inner side of hind tibije black or dark fuscous; middle of mesothorax 



nude, with sparse but strong punctures; smaller species 5. 



Hair on inner side of hind tibiie light ; larger species 6. 



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



