DIPTERA OF BAJA CALIFORNIA. 595 



imen referred by O. S. io H. aurata in the Biol. C.-A., 

 Dipt., seems to come close to this form. The large spec- 

 imen (14 mm.) is from San Jose del Cabo, and the oth- 

 ers are from El Taste. 



ACANTHOMERIDyE. 



6. AcANTHOMERA CHAMPiONi Osten Sacken, Biol. C- 

 A., Dipt, i, pp. 67-8. Costa Rica (W. Gierisch). One 

 female. Length, 45 mm. to end of 7th segment. The 

 two broader velvety black vittaj of thoracic dorsum are 

 continued on the sides of scutellum and meet on the hind 

 border, thus forming a velvety black margin to the scu- 

 tellum. The latter is not yellowish pruinose at base. 

 First abdominal segment is velvety black on front border, 

 as well as behind. The fifth segment is fully one -third 

 the width of fourth. The first and second antennal joints 

 are shining, but the third is opaque with more of a dull 

 grayish cast. The facial tubercle is moderately promi- 

 nent. In all other particulars agreeing with Osten Sack- 

 en's description, except that the shining spot of middle 

 of thoracic dorsum is nearer the scutellum (where the 

 pin enters), and is perhaps produced by the entrance of 

 the pin. 



The lateral edges of third and fourth segments are 

 sharp and ciliate. There are apparently no hind femoral 

 spines, but the face has a very distinct rounded -conical 

 tubercle just below base of antennte. Palpi are normal, 

 sublinear. 



TABANID^. 



7. SiLvius GiGANTULus Locw. Lake Tahoe, Sierra 

 Nevada, Cal. (C. Troyer). Two females. They meas- 

 ure 81^, and nearly 9 mm. The abdomen in both is of 

 an even deep yellow hue, with a faint tinge of orange. 

 The basal segment of the abdomen has the transverse 

 double cinereous marking, but there are no traces of cin- 



