AMERICAN HYMENOPTERA. 



29 



Description taken from Provancher's type and from one specimen 

 in Mr. Cresson's collection, both females and from Canada ; % not 

 known. 

 Homotropus decoratus Cr. {Bassus), Proc. Acad. Nat. Sci. Phila. 1878, 



375, I. 



5 .—Length 6 mm. Head and thorax black ; abdomen, except base and tip, 

 rufous : anterior orbits, scape beneath, spot below, mouth, tegulaj, spot in front, 

 line beneath, cuneiform line on margins of mesonotum, posterior margin of scu- 

 tellum and most four anterior cox* light yellow ; remainder of legs, except poste- 

 rior tarsi, which are dark brown, rufous. 



% .— Difiei-s in having the entire face, marginal lines on mesonotum recurved 

 into parallel lines above, transverse and longitudinal lines on mesosternum and 

 mesopleura; and all coxse and trochanters light yellow. The abdomen usually 

 has more black on it in the % . 



Eighteen female and seven male specimens from Nevada and 

 Southern California. 



BASSUS Grav. 



1. Ifetatorius Fabr. 



tripidicrus Walsh. 

 a. sycophanta Walsh. 

 h. terminalis Davis. 



2. orbititalis Cr. 



cinctulus Cr. 

 albicoxis Prov. 

 amcenus Prov. 

 orhitnlis Ashm. 

 .3. scutellaris Cr. 



4. concinnus Cr. 



5. pulchripes Prov. 



PROMETHUS Foers. 



1. costalis Prov. 



longicornis Prov. 

 aciculatus Prov. 

 auriculatus Prov. 



2. elongatus Prov. 



3. ruficrus Walsh. 



ZOOTREPHES Foers. 



1. frigidus Cr. 



2. scapulatus Prov. 



3. inconstans Davis. 



4. saginatus Prov. 



5. antennatus Davis. 



6. ichneumonides® Prov. 



7. montanus Davis. 



8. cingulatus Prov. 



LIST OF BASSINI. 



SYRPHOCTONU3 Foers. 



1. agilis Cr. 

 frontalis Cr. 

 jundus Prov. 



2. pleurdlis Cr. 

 syrphicola Ashm. 



3. robustus Davis. 



4. gillettii Davis. 



5. mellipes* Prov. 



6. maculifrons Cr. 

 semifasciatus Walsh. 



7. pacificus Cr. 



xanthopsis Ashm. 

 8. cressonii Davis. 



ENIZEMUM Foers. 

 1. tibiale Cr. 



HOMOTROPUS Foers. 



1. humeralis Prov. 



fnscitarsus Prov. 



2. bicapillaris Walsh. 



belangeri Prov. 



pedoralis Prov. 



a: albopictus Davis. 



3. pallipennis Prov. 



4. decoratus Cr. 



^ Only provisionally placed in the genus. 



TRANS. AM. ENT. SOC. XXII. 



FEBRUARY, 1895. 



