376 



PSYCHE. 



[July 1S90. 



(Generic name chived from a4>avTos, 

 forgotten, and tijit], honor.) 



The species of Aphantothmis resem- 

 ble the chrysotbni in having yellow 

 hairs and setae; in the prescutellar in- 

 dentation, in the neuration of the wings 

 and in the apical insertion of the anten- 

 nal arista. The females, however, re- 

 semble the males in coloring, and do 

 not have the abdomen largely yellow. 

 The hypopygium of Aphantotim^is is 

 disengaged and very large, thus resem- 

 bling that of the higher genera like 

 Dolichopus and Gymnoptermis ; while 

 the hypopygium in Chrysotiiiiiis is 

 small and partly embedded. There are 

 also differences in the size and shape of 

 the third antennal joint ; though this 

 character is not of generic value. 



The two minute species here de- 

 scribed, differ considerably in the struct- 

 ure of the hypopygium, but to just what 

 extent I have not ascertained, as this or- 

 gan must be examined in recently killed 

 specimens. Their close resemblance in 

 other respects, e. g. in the structure of 

 the antennae, neuration of the wings, 

 shape of the body and covering of yel- 

 low hairs, leads me to unite them in the 

 same genus. 



Aphantotimus willistoni, n. sp. $. 5. 



Length 1.5-1-75 mm.; length of wing 1.5 

 mm. 



Palpi pale yellow. Face metallic green, 

 smooth; covered with a thin layer of yellow- 

 ish dust, composed of minute scales that are 

 clearly discernible, and not closely aggre- 

 gated. Antennae entirely black, inclining to 

 piceous or brown when viewed from their 

 apices; third joint somewhat conical at the 

 insertion of the arista and covered with 



scarsely perceptible pubescence. Front rath- 

 er broad, blackish green, covered with the 

 same dust as the face; frontal setae and those 

 of the •^horax and abdomen pale yellow; cilia 

 of the inferior orbit yellow. Thoracic dor- 

 sum and scutellum golden green, overlaid 

 with yellow dust, consisting of minute 

 scales; pleurae bright golden green, less 

 dim than the thoracic dorsum, growing 

 black in the region of the tegulae. Cilia of 

 the tegulae yellow. Abdomen bright metal- 

 lic green, with a more violet than golden re- 

 flection ; covered with short and stiff jellow 

 hairs ; in the female the exserted ovipositer is 

 orange yellow; in the male the large hood- 

 shaped hypopygial capsule is shining black, 

 changing to metallic green in some lights; 

 appendages pale yellow; the two lamellae 

 rounded, fringed with yellow cilia; a long 

 and exposed blade-shaped organ (the penis.-') 

 extends from the base to the tip of the hypo- 

 pygium on the ventral side. Legs pale vel- 

 low; tips of the tarsi scarcely darker, covered 

 with short brown hairs, which turn to yellow 

 in some lights. In the male the fore coxae 

 are fuscous anteriorly and basally ; the pos- 

 terior coxae are fuscous with vellow tips ; in 

 the female the coxae are largely pale yellow, 

 there being only a large fuscous spot at their 

 bases. H:ilteres large, yellowish white. 

 Wings brownish hyaline with brownish 

 veins; the third and fourth longitudinal 

 veins parallel, and more approximated to 

 each other than the third longitudinal vein is 

 to the second. 



Habitat : Milwaukee Co., Wis. 



The single male and three females in 

 my collection were taken on the foliage 

 in a swampy wood in company with 

 hundreds of Dolichopods belonging to 

 the genera Dolichopus, Pclastonctirus, 

 Sympycnus, Ps Hop its and Chrysotus. 



Al*HANTOTIMUS FRATERCULUS, n. Sp. $. ?• 



Length 1-1.5 mm. ; length of wing 1.25 

 mm. 



