1978] 
Morris & Gwynne — Cyphoderris 
151 
Allotype. Adult o. Los Pinos Pass, Saguache Co., Col., U.S.A.; 
17 June 1977; Coll. D. T. Gwynne (Deposited ROM). 
Description of female allotype. Body length (fastigium to 
extremity of epiproct in dorsal view) 21.5 min; pronotum mid-line 
length 5.9 mm; caudal pronotum width 5.4 mm; length of ovipositor 
2.0 mm; length in lateral view of left metathoracic femur 9.6 mm. 
Diagnosis. Adult males of strepitans are similar in size and 
coloration to buckelli, but readily distinguished by the presence of 
the sternal process (Figures 3 & 4). Males of both strepitans and 
buckelli are generally smaller than males of monstrosa. In life they 
usually lack the vivid pink coloration of monstrosa" s venter, their 
venters being instead cream white. The styli of the IXth sternum are 
strongly depressed in monstrosa; viewed from above each stylus is 
sublanceolate and broadest at its base; they are inserted on the 
lamellate dorsal projection of the IXth sternum at a distance slightly 
greater than the stylus length. By contrast the styli of strepitans are 
distally dilated and broadly rounded (mitten-like), gently arcuate 
and tapering slightly to the base; they are inserted close together 
immediately adjacent to the inid-line with less than one stylus length 
between their bases. 
The sternal process of monstrosa, viewed in lateral outline, 
follows a broadly concave arc beyond the base of the styli to where 
it turns abruptly downward; in strepitans this arc is shorter and 
much shallower. From the end of the arc the process of monstrosa is 
more strongly reflexed than in strepitans and is often bent sharply 
forward at its extremity. 
We are unable at present to distinguish between females of 
buckelli and strepitans but both of these species may be separated 
from monstrosa by their lack of the ‘stridulatory’ organs of Ander 
(1938). In C. monstrosa these structures are located dorsolaterally at 
the junction of abdomen and thorax (Ander, 1938; Kevan, 1954; 
Duinortier, 1963). Each organ consists of a row of robust posteri- 
orly-directed recurved teeth on the slightly swollen posterolateral 
edge of the metanotum. The teeth contact a patch of transverse 
ridges on the first abdominal tergite during telescoping of the 
abdominal segment. Ander’s organs are present in both sexes and 
are readily seen in later stadia of immatures. While buckelli 
sometimes possesses weak thoracic teeth, it never exhibits the ridged 
