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Pomona College Journal of Entomology 



black, ventral surface very dark, front hairy. Eyes — Large, with distinct tuber- 

 cles, dark red. Antennae — (Figure 2.S8, 1 and 2). Reaching to the base of the 

 abdomen, sliglitly longer than half the lengtli of the body, arising from the head 

 just in front of the eyes, all except first two articles imbricated, covered with a 

 few long spines. Articles I and II dusky yellow or amber. III light at base with 

 amber or very dark apical four-fifths and the extreme tip darker, IV, V and VI 

 dark througiiout. Lengths of articles: I. 0.05 mm.; 11, 0.045 mm.; Ill, 0.205 

 mm.; IV, 0.1 mm.; V, 0.08 mm.; VI, 0.21 mm. (base 0.07 mm., spur 0.14 mm.); 

 total 0.69 mm. Articles I and II are often the same length, but the former is 

 always nmeh wider; III is not quite so long as VI, though very nearly so, but is 

 much longer than the spur, IV is equal to or slightly longer than V, each of 



Figure 238. Thomasia crucis n. sp. 



which is about half of III or VI. The sensoria are large and circular, being ar- 

 ranged irregularly on articles III, IV, V and in the process of VI as follows: 

 from four to nine. Forty-four articles were examined and the following number 

 of sensoria recorded: three had four, three had five, eleven had six, eight had 

 seven, sixteen had eight, and three had nine, four had from one to three, sixteen 

 were found with one, twenty-four with two, and six with tliree ; V has from one 

 to two — twenty-eight had one, and thirteen had two; article VI has the usual 

 number (five to six) at the base of the spur. On III the sensoria are situated 

 usually within the apical two-thirds ; on IV there is usually one in the middle 

 and the others within the apical one-half ; on V there is usually one in the middle 



