96 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 113 
Family Sphaeriodesmidae 
Genus Sphaeriodesmus Peters 
Sphaeriodesmus Peters, Monats. Preuss. Akad. Wiss. Berlin, p. 529, 1864. 
Sphaeriodesmus conformans Chamberlin 
Figure 37-7 
Sphaeriodesmus conformans Chamberlin, Proc. Biol. Soc. Washington, vol. 38, 
p. 44, 1925. 
Canal Zone, male, female and young, Barro Colorado Island, June 6, 
1923, O. F. Cook and H. F. Loomis; many females, Pifia area, March 
18, 1958, H. F. Loomis. 
Panama, many females, Juan Dias, June 3, 1923, O. F. Cook and 
H. F. Loomis; male, 2 females, Alahjuela, July 20, 1923, H. F. Loomis. 
Gonopods as shown in figure 37-7. 
Family Stylodesmidae 
Genus Botrydesmus Loomis 
Botrydesmus Loomis, Smithsonian Mise. Coll., vol. 89, p. 62, 1934. 
Botrydesmus coronatus, new species 
FicuRE 3k—m 
Houotyre: Male, USNM myriapod collection 2641, collected with 
Berlese funnel from inside log on Barro Colorado Island, Canal Zone, 
July 7, 1956, C. W. and M. E. Rettenmeyer, No. 2113. 
AuLLotTyPE: Female, Snow Museum, same data as for holotype. 
ParatypPes: Canal Zone, young male, Barro Colorado Island, March 
8-15, 1958, E. M. and H. F. Loomis; young male, Pifia area, March 18, 
1958, H. F. Loomis. 
Diaanosis: A smaller species than B. eryptus Chamberlin and with 
the two median lobes of segment 1 less separated by a sinus than 
the adjacent lobes; dorsum without a third ridge on each side. 
Description: Length 3 mm., width 0.5 mm. 
Head with sides of labrum and clypeus straight but oblique, sur- 
face slightly convex, smooth, shining and finely hispid to a line across 
tops of antennal sockets; vertex raised above front and with a strong 
median furrow; a large rounded tubercle behind and mesad of each 
antenna; crest of vertex with a row of six rounded tubercles increasing 
in size mesad; vertex roughened in front of crest but smooth behind it. 
Front margin of segment 1 (fig. 34) having 10 lobes of which the 2 
outermost on each side are little separated and nearly horizontal 
while the 6 intermediate ones are definitely upturned and separated 
by open sinuses; disk with 5 tubercles on each side, the 4 anterior 
