— 194 — 

 This is the species which occurs in our lists as cribripennis Thorn. 



S. lepidus Horn. L. c. 



Length .38 in. =9. 5 mm. Hab. Arizona. 



S. dolosus Horn. L. c. , 



Length .27--. 42 in. =7-. 10.5 mm. IJal>. Southwestern Texas. 



S. debilis Horn. I., c. 



Length .30--.36 in.=7. 5-9 mm. Hab. Utah. 



S. sobrius Newn lElaph.) described erroneously from U. S. is a Mexican 



nes. 



CLYTINI, 



The characters separating this tribe are discussed in the "Classifica- 

 tion.'' It is sufficient to say here that they are all easily recognized by 

 their resemblance to a few abundant species represented in even- cabinet. 

 For the assistance of the student the various structures whose differ- 

 ences serve to separate the groups and genera are figured * Also the 

 frontal carina: of all the species of Xylolrechus. This feature is best seen 

 by holding the insect with the front uppermost. Then under a glass ol 

 very moderate power it will be seen as an elevated ridge, quite smooth, 

 starting below the eyes and running to a little past them, and dividing 

 at about the middle of its length into two lines diverging towards the 

 sides of the head. The species to which this description does not apply 

 are niiidus, 4-iihicu!atus, and convergens. In these there are no diverging 

 lines and the division is only represented by an impressed space more 

 ir less extensive. In planifrom there is no carina at all and I have there- 

 fore placed it in C/j'.'us. With this explanation I think the synopses will 

 be easy to follow. 



Whatever completeness this paper may have is largely due to the 

 kindness of my friends in allowing me to use their material and I take 

 great pleasure in returning my thanks to Dr. Horn, the National Muse- 

 um at Washington, and Messrs. Smith, Julich, Roberts, Ricksecker and 

 s and to Mr. Samuel Henshaw 1 am again indebted for a careful 

 revision of the list of habitats. 



The genera are divided as follows 

 Epimera of metathorax produced over the angles of the 1st ventral segment, so a> t>> 

 enclose the hind coxae externally; 

 Front short, intercoxal process of 1st ventral segment rounded.. Group Cyllenes. 



Fn 'lit large, process acute Group Cly ti . 



Epimera of metathorax not produced, episterna linear; front large, intercoxal pro 



( ess acute. Group Anaglypti. 



Cyllenes. 

 Mesosternum usually convex in front, prosternum perpendicular at tip. 



Pronotum transversely excavated at sides near the l>asc . Cyllene. 



Pronotum not excavated, Trichoxys. 



T The plate u ill accompany a future number. 



