T. D. A. COCKERELL. 83 



Smaller; about 12i mm. long; hair of face mixed black and greyisb ; anterior 

 liaif of mesothorax black baired, hind part with fulvous hair; clypeus 

 longitudinally carinate jflacroglossapis nioiif eziiina (Cress.). 

 4. Ventral surface of thorax with light hair; legs without black hair. 



iVIelissodes dubitata Cress. (= Tetralonia 



atriventris fide Rob.). 



Ventral surface of thorax with black hair; hair of legs black, except on hind 



tibife and base of their tarsi ; a concave shining space on each aide of 



ocelli M. Ciiici Rob. = despoiisa Sm., Cress. 



^OTE.— Melissodes epicharina Ckll., from Arizona, might run to 

 dubitata, but it is quite different by having an entire, conspicuous 

 liair band, creamy in color, on second abdominal segment. Thorax 

 above with much black hair. 



M. epicharina var. a, has eyes green, and two abdominal bands, 

 the extra one being at base of .second segment. 



Group I. 



Puhescense of thorax above not all black, or if so, of pleura not black ; abdomen not 

 black without bands, and the apical part not all black. 



Abdomen covered with white tomentum ; small species. 



Xenoglossodes albata (Cress.). 



(The only species which could be confused with this is Melissodes stearnsi 



Ckll., which is easily distinguished by the dark tegulse, ochreous hair 



of front of thorax, etc.) 



Abdomen not so covered <. 1. 



1. Last two segments of abdomen covered with black or dark fuscous hair, ex- 



cept sometimes at extreme sides* 2. 



Last two segments of abdomen with the hair not, or not all (except extreme 

 sides) black or fuscous Group N. 



2. Hair of anterior and middle legs black, ferruginous on inner side of tarsi, large 



species, about 17 mm. long, robust, with hair of scutellum and hind 



part of mesothorax black .YIelissodes obliqua Say. 



(Compare here the following: 



M. coloradensis Cress, has hair of thorax above colored as in obliqua, but it 



is a smaller species, and hair of anterior and middle legs is fulvous. 

 M. Comanche Cress, has hair of thorax above colored like obliqua, but hair of 

 segments 5 and 6 is largely brown, and hair of anterior and middle legs 

 is reddish. It has the size of obliqua. 

 M hortivagans Ckll., var. a, has hair of anterior and middle legs nearly all 

 black, but is much smaller than obliqua.) 

 Not so 3. 



* Florilegus condigna Cress., Tetralonia belfragei (Cress.) and T. cressoniana Ckll., 

 might, perhaps, be looked for here, but they show too much white at sides of seg- 

 ment 5. They are placed in the table with this reservation. 



TBANS. AM. ENT. SOC. XXXII. J.A.NUARY, 190G. 



