148 



PSYCHE. 



3. Najisigaster punctulata Will. 

 One specimen (Ckll.). Rincon, July 5. 

 On Chilopsis Ihiearis. See section II of 

 paper on Rio Nautla dipteia, for notes 

 on separation of species of this genus. 



4. Melanostoma stegnuvi Say- One 

 9 (Ckll.). LasCruces. March 26. On 

 flowers oi Pruniis (plum). 



5. Eupeades vohicris OS). Fivers 

 (Ckll.). Las Cruces. One, March 2, 



three March 31, and one April 16, on 

 flowers of Sisymbrium canescens. 

 Length, 6 J to nearly 9 mm. I have 

 also a $ (Ckll.) from Roswell, in the 

 Rio Pecos Valley, taken April 14, on 

 flowers of Sisymbrium. 



6. Baccha lemur OS. One 9 . Las 

 Cruces, August 11. Front and vertex 

 metallic purplish-ljlack, but thorax 

 metallic greenish. Abdomen purplish, 

 of same shade as front. 



7. Voliicellacomstocki'^WX. Three 

 ^s, and one 9 (Ckll.). Las Cruces. 

 Two $ s, March 23 ; 9 March 26 ; one 

 $ April I. AH on flowers of Pritmts 

 (plum). Length, 10 to 11 mm. 



CONOFIDAE. 



8. Zodion splendens Jaenn. One $ . 

 Las Cruces, August 21. On flowers of 

 Aphantostephus arizonicus Gray. 

 This specimen measures but little over 

 6 mm., yet it is without doubt the same 

 species as another g (Soledad Caiion, 

 Organ Mts.) which measures 11 mm. 

 and is, so far as absolute bulk is con- 

 cerned, at least five times as large as the 

 present one ! The metanotum is shining 

 black in the present specimen, but there 



is very little black on the pleurae. 

 Scutellum reddish-yellow. Abdomen 

 same color, with the pollen as described 

 by Williston (in Z. leucostoma). 



GYMNOSOMATlDx^E. 



GYMXOSOMA. 



The occurrence in New Mexico of 

 the genus Gymnosoma has never been 

 recorded, and heretofore had not been 

 suspected. During several of the earlier 

 years of mv collecting in that region, I 

 never met with a specimen, and I had 

 come to suppose that the New Mexico 

 region was outside of the faunal limits 

 of the genus, due to the general arid 

 character of the country combined with 

 the elevation. Both Gymnosoma and 

 Cistogaster, which two genera form the 

 group G^'mnosomatidae, are preem- 

 inently inhabitants of the humid low- 

 lands of temperate North America. 

 They occur plentifully along the Atlan- 

 tic coast slopes, and in the Mississippi 

 Valley and Great Lakes regions. In 

 this respect they resemble the genus 

 Trichopoda, except that the latter is 

 even more highly developed in the trop- 

 ical lowlands than in the temperate. 

 Trichopoda, besides, is strictly Ameri- 

 can, and most developed in humid coast 

 regions. It seems absent from subarid 

 coast regions, such as the southern por- 

 tion of Texas between the Rio Nueces 

 and the Rio Grande — the Costa Deserta 

 of the old Spanish historians. Cistogas- 

 ter and Gymnosoma are both recorded 

 from portions of humid tropical Amer- 



