INVESTIGATIONS ON THE MUTILLDD WASPS 157 



pale golden pubescence; sternites 3-5 with moderate, contiguous 

 punctures; sternites 3-4 sparsely clothed with erect, pale hairs, and 

 each with an apical fringe of pale golden pubescence ; apical fringe 

 and pubescence of sternite 5 dark, almost black. 



Legs dark mahogany red, sparsely clothed with long, dark hairs 

 above, long, pale hairs below ; calcaria black. 



Holotype.—FQmale, Cat. No. 40730, U.S.N.M., Brewster County, 

 Tex., Rio Grande, June 13-17, 1908 (Mitchell and Cushman). 



Paratypes.—5 females, Brewster County, Tex., Rio Grande, June 

 13-17, 1908 (Mitchell and Cushman), in collection of United States 

 National Museum and University of Minnesota. 



This species resembles hioculata and its allies to some extent in 

 form and vestiture, but differs in having the antennal scrobes feebly 

 carinate above, and in having tergites 3-5 clothed entirely with pale 

 golden pubescence. It also differs from any other species of this 

 genus that I have seen in the character of the antennae. The longi- 

 tudinal grooves of flagellar segments 3-10 are very characteristic. 

 There is some question as to whether this is really a valid morpho- 

 logical character, or whether it is due to some factor in collecting 

 the specimens. All of the specimens are alike in this, however, 

 except one; five have the groove present on segments 3-10, while 

 one has the groove present only on segments 5-10. If this character 

 should prove to be a valid one, it will greatly facilitate the recogni- 

 tion of this species. It runs out in the key with melcmi'p'pe and 

 ■jtammifera^ from both of which it is quite distinct. The paratypos 

 vary in length from 8.15 to 13 mm. 



Group QUADRIGUTTATA 



Females with the head narrower than the thorax ; antennal scrobes 

 not carinate above except in cariniceps; the postero-lateral angles 

 of the head prominent, usually tuberculate ; thorax long, subhexago- 

 nal, scutellar scale present; pygidium longitudinally striate; pubes- 

 cence very sparse (except in calif ornica) . Males unknown. 



51. DASYMUTILLA QUADRIGUTTATA (Say) 



Mutilla guadrigttttata Say, West. Quart. Rep., vol. 2, p. 74, 1823, female. — 

 LeConte, " Writings of Thomas Say," vol. 1, p. 163, 1859, female. — ^Blake, 

 Trans. Amer. Ent. Soc, vol. 7, p. 245, 1879, female. — Dalle Toebe, Cat. 

 Hymen., vol. 8, p. 76, 1897, female. — Fox, Trans. Amer. Ent. Soc, vol. 25, 

 p. 239, 1899, female (part), — Melandeb, Trans Amer. Ent. Soc., vol. 29, 

 p. 297, 1903, female (part).— Hayes, Bull. Brooklyn Ent. Soc, vol. 19, 

 p. 153, 1924, female, 



Mutilla {Sphaerophthalma) quadriguttata Blake, Trans. Amer. Ent. Soc, 

 vol. 3, p. 246, 1871, female. 



