84 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 92 
Remarks.—This subgenus is erected for two species from the Orient 
(bistriatus and sinuatus), which have an unusually strongly narrowed 
pronotum and a different type of lateral fovea. They are readily 
distinguished from Lispinus sensu stricto. 
Genus HOLOSUS Motschulsky 
Holosus Motscuusky, Bull. Soc. Imp. Nat. Moscou, vol. 30, p. 496, 1857. 
Diagnosis.—Having the characters listed above for the subfamily 
Osoriinae, the tribe Lispinini, and thesubtribe Lispini; pronotum broad, 
strongly narrowed in front or behind; hypomeron with a raised line 
forming an angle near the front coxa; abdominal sternites with diagonal 
strigae. 
Remarks.—This genus was originally described for five new species 
thought to be related to Lispinus and Holotrochus but distinguished 
by the body shape, which is broader and more like that of certain 
Tachyporinae. All five of these species were described as having the 
diagonal strigae on the abdominal sternites. Most of the species 
subsequently assigned to the genus had these diagonal strigae, but 
many species of Lispinus also had that character, and the two genera 
have been separated principally on the rather unsatisfactory differ- 
ence in their shape. 
I have found that some of the original species of Holosus (tachini- 
formis, mycetoporiformis, and olisthaeriformis) differ from one of the 
others in having the raised line on the hypomeron (the deflexed portion 
of the pronotum) enclosing a much larger and more transverse area, 
the angle of this line nearest to the coxa being distinctly acute, 
whereas in tachyporiformis it is right or obtuse. For the latter I am 
proposing the subgenus Neolosus, but the first group contains two 
very different pronotal types. H. tachiniformis has the pronotum 
transverse and strongly narrowed in front and is placed in the subgenus 
Holosus sensu stricto. H. mycetoporiformis and olisthaervformis have 
the pronotum narrowed behind with the sides emarginate and are 
placed in the new subgenus Relinda. 
I have seen only six species that can be retained in this genus as 
here defined. 
Subgenus HOLOSUS sensu stricto 
Diagnosis.—Having the characters listed above for the genus 
Holosus; pronotum not transversely impressed before base, strongly 
narrowed in front; hypomeron with a raised line forming an acute 
angle near the front coxa and enclosing a large and nearly transverse 
area. 
Remarks.—This subgenus has a very distinctive form. It probably 
includes all the species that might be described as navicular, those 
