THE CASTIANEIRINAE OF MEXICO. I. 
CASTIANEIRA DUG ESI (BECKER) 
(ARANEAE: CLUBIONIDAE)* 
By Jonathan Reiskind 
Department of Zoology, University of Florida, 
Gainesville, Florida 3261 1 
Since the revision of the Castianeirinae of North and Central 
America (Reiskind, 1969) new collections have been made and 
studied. This is the first of a series of papers that will update the 
Mexican component of this subfamily. 
Castianeira dugesi (Becker) has been known from a single male 
described almost a century ago. Recent collections from locations 
within 50 miles of the type locality have produced additional speci- 
mens including the first females. C. dugesi is the nominal species in 
the dugesi species-group (which also includes C. nanella Gertsch and 
C. alfa Reiskind), a group restricted to the dry regions in south- 
western U. S. and northwestern Mexico and characterized by its 
moderately small size, lack of plumose setae, and distinctive genitalia 
(Reiskind, 1969). As is characteristic of many ant mimicking spe- 
cies of Castianeira with no distinct morphological separation of 
cephalic from thoracic region the cephalic region in C. dugesi is 
marked off by color pattern which we can assume reflects the color 
pattern of the model ant. 
Castianeira dugesi (Becker) 
Figures 1-3 
Micariaulax dugesii Becker, 1879, Ann. Soc. Entomol. Belgium, 22: 83, pi. 2, 
fig. 9, 10, $, from Guanajuato, Mexico; in the Brussels Museum. 
Castianeira dugesii: Simon, 1897, Histoire Naturelle des Araignees 2(1) : 167. 
Castianeira dugesii: F. P.-Cambridge, 1899, Biol. Centrali-Americana. 
Arachnida 2 : 81. 
Castianeira dugesii: Reiskind, 1969, Bull. Mus. Comp. Zool. 138(5): 223- 
225, pi. 10, fig. 127, 128. 
FEMALE 
Measurements. Based on two females: carapace length 2.65- 
2.70 mm; carapace width 1.70- 1.75 mm; carapace index (carapace 
width carapace length X 100) 64; sternum length 1.15 mm; 
* Manuscript received by the editor February 28, 1974 
178 
