SEVENTEENTH ANNUAL REPORT. 



453 



Fig. 180.— Dorsal view, female 

 Dcrmacentorvariegatus. B. A. I 

 Coll. 3172. 



(2) 1 elongate reniform dark spot back of these, near side of shield; (3) 1 more or 

 less distinct forked longitudinal dark band extending from pseudo-scutum to near 

 posterior margin; 1 median, 2 submedian elongate dark spots, posterior; (4) margi- 

 nal groove, external border, and 5 median postero-marginal shields are also dark. 

 Entire surface finely and sparsely punctate, with micro- 

 scopic white hairs. Ventral surface as in the female, 

 except differences due to coxse. Genital pore between 

 coxaj II. Stigmata round to comma-shaped. Capit- 

 ulum 700 /< long; base same dimension as in female, 

 postero-lateral angle prolonged, prominent; digit of 

 mandibles 185 //, similar to those of male D. reticulatus; 

 hypostome as in D. reticulatus; palpi shorter than in 

 female, especially second article. Legs: coxae increase 



in size and become 

 more convergent from 

 I to II; pair IV very 

 large; their posterior 

 margin may be about 

 on a line with poste- 

 rior margin of stig- 

 mata, their median 

 margin nearly paral- 

 lel for some distance; 

 same projections as 

 in female, but pos- 

 tero-median tubercle 

 absent from coxae 



IV; other articles of legs similar to D. reticulatus. 



Female. — Body depressed, oblong, sides nearly 

 parallel, nearly as broad anteriorly as posteriorly, 

 5 to 17 mm. long, 2.5 to 10 mm. broad, color red- 

 dish brown (alcohol speci- 

 mens) ; capitulum and legs 

 not so dark. Scutum elon- 

 gate, subpentagonal, ex- 

 tending nearly to the mid- 

 dle of the back in young specimens, deeply excavate ante- 

 riorly, so as to form two antero -lateral acute points; cervical 

 grooves curved, deep in front, broad and not very distinct in 

 back; punctations fine, numerous; color light brown, with 

 some thin white rust of slightly metallic effect, and leaving 

 exposed a median longitudinal band, the cervical grooves, 

 and a small band along the convexity of the latter, and a 

 brown spot median of the light brownish eyes. Dorsal 

 surface roughened with numerous punctations provided with 

 very short whitish hairs; marginal grooves well marked; 3 

 longitudinal grooves. Ventral surface covered with fine 

 hairs; genital pore between coxae II, narrow, oval, sur- 

 rounded by a broad swelling; genital grooves close to each 

 other in their anterior portion; diverging back of coxae IV; the genital and ano- 

 marginal grooves similar to those of D. reticulatus. Stigmata larger than coxae IV, 

 whitish or brownish, irregularly oval, with or without dorsal prolongations. Capit- 

 ulum 1 mm. long, posterior border sinuous, postero-lateral angles slightly or promi- 

 nently salient; porose areas deep. Mandibular digit 180 ja long, similar to that of 



Fig. 181.— Ventral view of same. 



Fig. 188.— Coxa I of Derma- 

 centor electus; diagram. 

 Greatly enlarged. Orig- 

 inal, 



